Cisco ISE - Line Card ISE User manual

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Software Configuration of ATM ISE Line Cards for
Cisco 12000 Series Routers
This feature module describes the software configuration for the Cisco 4-Port ATM Internet Services
Engine (ISE) line cards in the Cisco 12000 Series Router. The line card comes in two variations:
OC-12c/STM-4c and OC-3c/STM-1; otherwise, the features are the same on both cards.
Feature History for the 4-Port ATM ISE Line Card
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image
support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on
Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at
the login dialog box and follow the instructions that appear.
Contents
•Prerequisites for the 4-Port ATM ISE Line Card, page 2
•Restrictions for the 4-Port ATM ISE Line Card, page 2
•Information About the 4-Port ATM ISE Line Card, page 3
•How to Perform a Basic Configuration of the 4-Port ATM ISE Line Card, page 5
•How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card, page 8
•How to Configure AToM VCs on the 4-Port ATM ISE Line Card, page 35
•Troubleshooting ATM Errors on the 4-Port ATM ISE Line Card, page 76
Release Modification
12.0(25)S The 4-Port OC-12c/STM-4c ATM ISE line card was introduced.
12.0(26)S2 The 4-Port OC-3c/STM-1 ATM ISE line card was integrated into 12.0(26)S.
12.0(27)S1 The 4-Port OC-3c/STM-1 ATM ISE line card was introduced. AToM,
Layer 2/Layer 3 features on a single port and enhanced QoS policing
features were introduced.

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers
Prerequisites for the 4-Port ATM ISE Line Card
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•Configuring Modular QoS CLI, page 84
•Additional References, page 91
•Command Reference, page 92
•Glossary, page 98
Prerequisites for the 4-Port ATM ISE Line Card
There are no prerequisites for using the 4-port ATM ISE line card.
Restrictions for the 4-Port ATM ISE Line Card
Restrictions and limitations for the 4-Port ATM ISE line cards are listed in Table 1 and Table 2.
Table 1 Supported Values for 4-Port ATM ISE Line Card
Feature Limitation
Maximum number of cell packing or policing VCs1
1. VC=virtual circuit.
508 per port2
2. Hardware limitation.
Maximum number of active VCs3:
Layer 2
Layer 3
3. Subject to overall system limitation and configuration.
10244per port and card
20473per port and card
4. If cell packing or policing are configured, the remaining 516 available VCs can be configured for cell relay over MPLS or
AAL5 over MPLS.
Range of VPI5values
5. VPI=virtual path identifier.
Varies with vc-per-vp value.
In Release 12.0(25)S: up to 255
In Release 12.0(27)S:
UNI VPIs—up to 255; NNI VPIs—up to 4095
Range of VCI6values
6. VCI=virtual channel identifier.
Varies with vc-per-vp value, up to 65,535
Table 2 Scalability Limitations for the 4-Port ATM ISE Line Card
Feature
Layer 2
Limitation
Maximum number of AToM Tunnels per port 1024
Maximum number of AToM Tunnels per line card 1024
Maximum number of AToM Tunnels per router 2048
Maximum number of AToM Tunnels per port with features1508
Maximum number of AToM Tunnels per port with cell packing 508

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Information About the 4-Port ATM ISE Line Card
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Information About the 4-Port ATM ISE Line Card
The 4-Port ATM ISE line cards, which deliver line rate OC-12c/STM-4c or OC-3c/STM-1 bandwidth,
provide enhanced Layer 2 and Layer 3 capabilities for high-speed customer aggregation, backbone
connectivity, and peering solutions. These cards perform traffic shaping and per-virtual circuit (VC)
queueing, and support per-VC Modified Deficit Round Robin (MDRR) with per-VC low latency
queueing (LLQ). They also support Any Transport over MPLS (AToM), enhanced traffic policing, and
the ability to configure both AToM VCs and terminated VCs on a single port.
MDRR is implemented on a per-VC basis with up to eight queues per VC, where one of the queues is a
low latency queue (LLQ). Both per-VC Weighted Random Early Detection (WRED) and per-VC MDRR
are performed in the hardware.
The 4-Port OC-12c/STM-4c ATM ISE line card provides the Cisco 12000 Series Router with four
622-Mbps ATM interfaces. The 4-Port OC-3c/STM-1 ATM ISE line card provides four 155-Mbps ATM
interfaces. The cards communicate with the Cisco 12000 Series Router switch fabric.
Features of the 4-Port ATM ISE Line Card
The following are the features supported by the 4-Port ATM ISE line cards:
•Traffic shaping on a per-VC and per-virtual path (VP) basis with a minimum granularity of 1 Kbps,
in compliance with I.371 granularity definition.
•Per-VC queueing using configurable per-VC queue limits or per-VC WRED.
•A VC address can be any of the virtual path identifier (VPI) and virtual channel identifier (VCI)
range. User-network interface (UNI) VPIs can be in the range of 0..255; network-to-network
interface (NNI) VPIs can be in the range of 0..4095. VCIs can be in the range 0..65,535.
•Per-VC statistics through hardware.
•Per-port statistics through hardware.
•AAL5 [I.362] [I.363] reassembly and segmentation.
•Non-real-time variable bit rate (VBR-nrt) and real time variable bit rate (VBR-rt) traffic shaping
with 99+ percent shaping accuracy.
•Constant bit rate (CBR) traffic shaping with 99+ percent shaping accuracy.
•Unspecified bit rate (UBR) with support for optional peak cell rate (PCR) parameter with 99+
percent shaping accuracy.
•VP tunnel traffic shaping for the full range of VPI on UNI interfaces—up to 256 VP tunnels per port.
•Maximum transmission unit (MTU) of up to 9180 bytes.
•Each VC supports up to 9K MTU.
Maximum number of AToM Tunnels per line card with features11024
Maximum number of AToM Tunnels per line card with cell packing 1024
1. Includes features such as policing
Table 2 Scalability Limitations for the 4-Port ATM ISE Line Card (continued)
Feature
Layer 2
Limitation

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•F4 and F5 flows of operation, administration, and maintenance (OAM) cells and OAM management
specified as requirements by [UNI 3.x] [I.610].
Layer 3-Specific Features
•Supports up to 2047 traffic-shaped VC connections per interface.1
•Bidirectional OC-12c/STM-4c line rate for 64-byte packets (two cells) on all four ports. This is an
aggregate line rate of approximately 2.8 million packets per second.
•Bidirectional OC-3c/STM-1 full line rate for any packet size on all four ports.
•Support for up to 120 distinct WRED profiles per interface. These profiles are configurable using
Cisco IOS software.
•ATM VC bundle management.
•MPLS Traffic Engineering (TE), including Single Area (OSPF,ISIS), DS-TE (OSPF,ISIS),
Autobandwidth, TE Metrics (OSPF,ISIS), TE Node Exclusion (OSPF,ISIS), Multiarea (OSPF,ISIS).
•Support for thousands of ACL/xACL entries, including both ingress and egress for interfaces and
subinterfaces.
•Committed Access Rate (CAR), including CAR action continue, including both ingress and egress
for interfaces and subinterfaces.
•Policy-based routing (PBR) for interfaces and subinterfaces.
•Border Gateway Protocol (BGP) policy accounting.
•Unicast reversepath forwarding (uRPF) loose mode.
•Sophisticated MQC classifications based on IP ACL/xACL, IP precedence/DSCP, MPLS EXP, QoS
groups, and more.
•IP and MPLS traffic marking
•QoS Policy Propagation via BGP (QPPB)
•Ingress IP-based traffic shaping.
•Netflow, including sampled ingress/egress Netflow, aggregated Netflow, and MPLS-aware Netflow.
•High Availability, including route processor redundancy (RPR), RPR+, and Stateful Switchover
(SSO).
•ATM OAM F5 continuity check.
•MPLS virtual private network (VPN).
•UNI 3.x and Interim Local Management Interface (ILMI).
•Switched virtual circuit (SVC) support for point-to-point and point-to-multipoint connections.
•Multicast packet replication.
•ATM cell loss priority (CLP) bit setting.
•MPLS VPN Inter-AS.
•MPLS VPN carrier supporting carrier (CsC).
Layer 2-Specific Features
•Supports up to 2047 traffic-shaped VC connections per interface.2
1. Subject to overall system limitation and configuration.

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•Any Transport over Multiprotocol Label Switching (MPLS) [AToM].
•AT M OA M E m u l a t i o n
•Cell-based policing
•Experimental bit marking
•Cell packing for port, VC, and VP modes
•Cell relay for port, VC, and VP modes
How to Perform a Basic Configuration of the 4-Port ATM ISE Line
Card
The 4-port ATM ISE line cards provide the ability to configure Layer 2 AToM VCs as well as Layer 3
terminated VCs. On any individual ATM interface, you can configure both AToM VCs and terminated
VCs as required. The configurations of these are discussed in subsequent sections in this document. This
section provides basic ATM interface configuration information and discusses those features that are
applicable to both AToM VCs and terminated VCs.
Configuring ATM interfaces and virtual circuits is described in the following sections:
•Configuring an ATM Interface, page 5
•Configuring UNI and NNI Cell Support, page 7
•Troubleshooting Tips, page 7
Configuring an ATM Interface
Use the show running-config command to display current port configuration information. On power up,
the interface on a new 4-Port ATM ISE line card is shut down. To enable the interface, you must enter a
no shutdown command in configuration mode.
Default Interface Configuration
When the 4-Port ATM ISE line card is enabled (taken out of shutdown) with no additional configuration
commands applied, the default interface configuration file parameters, described in Table 3, are used.
2. Subject to overall system limitation and configuration.
Table 3 4-Port ATM ISE Line Card Default Configuration Values
Parameter Configuration File Entry Default Value
Maximum transmission unit (MTU) [no] mtu bytes 4470 bytes
Maximum numbers of virtual circuits [no] atm maxvc numvc 2047
Loopback [no] loopback [diagnostic | line] no loopback
Internal clock [no] atm clock internal no atm clock internal
SONET framing [no] atm sonet stm-4 no atm sonet stm-4

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Configuration Basics
After you verify that the new 4-Port ATM ISE line card is installed correctly, use the configure command
to configure the new interface. Be prepared with the information that you will need, such as the interface
IP address.
The Cisco 12000 Series Router identifies an interface address by its line card slot number and port
number, in the format slot/port. Because each 4-Port ATM ISE line card contains four ATM interfaces,
the port numbers are 0 to 3. For example, the slot/port address of an ATM interface on a 4-Port ATM ISE
line card installed in line card slot 2 is 2/0 to 2/3.
Use the following procedure to create a basic configuration, including enabling an interface and
specifying IP routing. You might also need to enter other configuration subcommands, depending on the
requirements for your system configuration.
(For descriptions of configuration subcommands and the configuration options available, refer to the
appropriate software publications in the “Related Documents” section on page 91.)
SUMMARY STEPS
1. show version
2. show interfaces
3. enable
4. configure terminal
5. interface atmslot/port
6. no shutdown
7. Ctrl-Z
8. copy running-config startup-config
DETAILED STEPS
Command or Action Purpose
Step 1 show version Confirm that the system recognizes the line card.
Step 2 show interfaces Check the status of each port on the line card.
Step 3 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 4 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 5 interface atmslot/port
Example:
Router(config)# interface atm1/3
Enter interface configuration mode for the specified ATM
interface.

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Configuring UNI and NNI Cell Support
You can designate that the cell format for an interface be either User Network Interface (UNI) or
Network Node Interface (NNI). The default setting is UNI. Use the atm maxvpi-bits command to
change the maximum VPI range from 0..255 (UNI) to 0..4095 (NNI).
Router(config)# interface atm 2/2
Router(config-if)# atm maxvip-bits 12
To change the interface setting back to NNI, use the no form of this command: no maxvip-bits 12.
This configuration should be entered before the connection is added.
Troubleshooting Tips
To verify the operation of the interfaces configured on the 4-Port ATM ISE line card, use the following
commands:
To display information about the current state of the ATM network, use the following commands:
Step 6 no shutdown
Example:
Router(config-if)# no shutdown
Change the state of the interface to up and enable the
interface.
Step 7 Press Ctrl-Z Exit configuration mode.
Perform this after completing all desired configuration
commands on the interface or subinterface.
Step 8 copy running-config startup-config Write the new configuration to memory.
Command or Action Purpose
Command Purpose
Router# show version Displays the configuration of the system hardware, the software release, the
names and sources of configuration files, and the boot images. Verify that
the list includes the newly configured 4-Port ATM ISE line card ports and
interfaces.
Router# show gsr Displays information about the hardware modules installed in the
Cisco 12000 Series Router.
Router# show interfaces atm slot/port Displays information about the ATM interfaces. For example, to display
information about slot 2, port 0, enter:
Router# show interfaces atm2/0
Router# show running-config Displays information about the currently running configuration in RAM.

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How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card
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How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE
Line Card
The following configuration tasks are described in this section:
•Configuring Layer 3 Terminated Virtual Circuits, page 8
•Configuring ATM Shaping on Terminated VCs, page 9
•Configuring OAM Management on Terminated VCs, page 11
•Configuring Quality of Service on Terminated VCs, page 14
•Configuring and Managing VC Bundles, page 28
•Configuring Bridged PVCs, page 35
Configuring Layer 3 Terminated Virtual Circuits
A virtual circuit (VC) is a point-to-point connection between two ATM devices. A VC is established for
each ATM end node with which the router communicates. The characteristics of the VC are established
when it is created and include the following for the 4-Port ATM ISE line cards:
•Quality of service (QoS)
•ATM adaptation layer (AAL) mode
•Encapsulation type (LLC/SNAP, IP MUX, and NLPID)
•Peak and average transmission rates
Permanent virtual circuits (PVCs) configured on the router remain active until the circuit is removed
from the configuration. All virtual circuit characteristics apply to PVCs. When a PVC is configured, all
configuration options are passed to the 4-Port ATM ISE line card. These PVCs are written to the
nonvolatile RAM (NVRAM) as part of the configuration and are used when the Cisco IOS image is
reloaded.
When you create a PVC, you create a virtual circuit descriptor (VCD) and attach it to the VPI and VCI.
The VCD tells the card which VPI/VCI to use for a particular packet. The 4-Port ATM ISE line card
requires this feature to manage the packets for transmission. The number chosen for the VCD is
independent of the VPI/VCI used.
A permanent virtual path (PVP) is like a bundle of VCs, transporting all cells with a common VPI, rather
than a specific VPI and VCI.
PVCs are created and configured using the pvc command in interface configuration mode. PVPs are
created and configured using the atm pvp command in interface configuration mode.
The syntax of the pvc command is as follows:
pvc [name] vpi/vci
Command Purpose
Router# show atm interface atm slot/port Displays current ATM-specification information about the 4-Port ATM ISE
line card interface.
Router# show atm traffic Displays current ATM statistics.

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The syntax of the atm pvp command is:
atm pvp vpi
vpi is the ATM network VPI to use for this virtual circuit, in the range of 0 to 255 for UNI or 0 to 4095
for NNI; vci is the ATM network VCI to use for this virtual circuit, in the range of 0 to 655,535.
Troubleshooting Tips
To display information about the connected virtual circuits, use the following commands:
Configuring ATM Shaping on Terminated VCs
The 4-Port ATM ISE line cards support IP traffic shaping on terminated VCs. The following ATM
shaping options are available:
•Constant bit rate (CBR)—Supports real-time applications that request a static amount of bandwidth
that is continuously available for the duration of the connection. (See Step 5.)
•Real-time variable bit rate (VBR-rt)—Supports real-time applications that have bursty transmission
characteristics. (See Step 6.)
•Non-real-time variable bit rate (VBR-nrt)—Supports non-real-time applications with bursty
transmission characteristics that tolerate high cell delay, but require low cell loss. (See Step 7.)
•Unspecified bit rate (UBR)—Supports non-real-time applications that tolerate both high cell delay
and cell loss on the network. There are no network service-level guarantees for the UBR service
category, and therefore it is a best-effort service. (See Step 8.)
To configure ATM shaping, perform the shaping commands in PVC mode. You should use only one of
the shaping commands in Step 5 through Step 8, depending on the type of shaping to be configured.
Restrictions
CDVT
When traffic shaping is configured on a VC, the cell delay variation (CDV) is set for the VC. This value
will change according to the shaping class defined. The cell delay variation tolerance (CDVT) values are
shown in Table 4.
Command Purpose
Router# show atm pvc Displays current ATM PVC information.
Router# show atm vc Displays current ATM VC information.
Table 4 CDVT per Traffic Class for Traffic Shaping
Traffic Class OC-12c/STM-4c Line Card OC-3c/STM-1 Line Card
CBR 70 μsec 70 μsec
UBR 185 μsec 305 μsec
VBR-RT 70 μsec 70 μsec
VBR-NRT 185 μsec 305 μsec

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Note For VBR connections in which the sustainable cell rate (SCR) is not equal to the PCR value, the CDVT
is significantly lower.
Decreased VC Throughput
If you configure a VC on a 4-Port OC-12/STM-4 ATM ISE interface with a peak cell rate (PCR) or
sustainable cell rate (SCR) greater than OC-6 (using the ubr, vbr-nrt, vbr-rt, or cbr commands), and
attach a traffic policy with MDRR (configured using the bandwidth command) to the interface for
specified traffic classes, when traffic on the interface from the specified classes is equal to or greater than
the configured PCR or SCR values, frequent queueing and dequeueing changes occur between the
MDRR queues and may cause a decreased VC throughput.
Decreased throughput is more likely to occur when the traffic consist of small packets and when a high
amount of traffic is sent toward the high-priority queue. Such traffic will increase significantly the
frequency of switches between queues, which may cause the nonpriority queues to lose their bandwidth.
Therefore, when configuring a VC to more than OC-6, it is recommended to limit the high priority traffic
using the police command.
SUMMARY STEPS
Use either Step 5, Step 6, Step 7 or Step 8 depending on the desired shaping.
1. enable
2. configure terminal
3. interface atmslot/port.subinterface
4. pvc vpi/vci
5. cbr pcr
6. vbr-rt pcr scr
7. vbr-nrt pcr scr
8. ubr pcr
DETAILED STEPS
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 interface atmslot/port.subinterface
Example:
Router(config)# interface atm1/0.2
Specifies an ATM interface or subinterface to configure.
Configure subinterfaces so that you can take advantage of
access list definitions for the IP traffic.

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Configuring OAM Management on Terminated VCs
OAM may be enabled for PVC or SVC management on terminated VCs. To configure OAM management
for an ATM Layer 3 PVC, perform the following procedure.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atmslot/port.subinterface [point-to-point | multipoint]
4. pvc vpi/vci
5. oam-pvc manage
6. oam retry up-count down-count retry-frequency
7. oam-pvc manage cc {end | segment} [direction {both | sink | source}] [keep-vc-up [end aisrdi
failure | seg aisrdi failure]]
8. oam retry cc {end | segment} [activation-count [deactivation-count [retry-frequency]]]
Step 4 pvc [name] vpi/vci
Example:
Router(config-if)# pvc 0/100
Specifies a PVC with the specified VPI and virtual circuit
identifier (VCI).
Step 5 cbr pcr
Router(config-if-vc)# cbr 155000
Specifies CBR shaping.
The pcr value indicates the peak cell rate. The range is from
38 to 622,000 Kbps.
Note Use either Step 5, Step 6, Step 7, or Step 8.
Step 6 vbr-rt pcr scr burst
Example:
Router(config-if-vc)# vbr-rt 100000 40000
200000
Specifies VBR-rt shaping.
The pcr value indicates the peak cell rate, and its range is
from 38 to 622,000 Kbps. The scr value indicates the
sustainable cell rate, and its range is from 38 to pcr Kbps.
The burst value indicates the burst size, in number of cells.
Step 7 vbr-nrt pcr scr mbs
Example:
Router(config-if-vc)# vbr-nrt 100000 40000
200000
Specifies VBR-nrt shaping.
The pcr value indicates the peak cell rate, and its range is
from 38 to 622,000 Kbps. The scr value indicates the
sustainable cell rate, and its range is from 38 to pcr Kbps.
The mbs value indicates the maximum burst size, in number
of cells.
Step 8 ubr pcr
Example:
Router(config-if-vc)# ubr 100000
Specifies UBR shaping.
The pcr value indicates the peak cell rate, and its range is
from 38 to 622,000 Kbps.
Command or Action Purpose

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DETAILED STEPS
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 interface atmslot/port.subifnum
{point-to-point | multipoint}
Example:
Router(config)# interface atm1/3.2
point-to-point
Specify the new ATM subinterface to configure.
Step 4 pvc [name] vpi/vci
Example:
Router(config-subif)# pvc 10/50
Specify an ATM PVC.
Step 5 oam-pvc manage [frequency]
Example:
Router(config-if-atm-vc)# oam-pvc manage
Enable OAM management.
Step 6 oam retry up-count down-count
retry-frequency
Example:
Router(config-if-atm-vc)# oam retry 3 5 1
(Optional) Specify OAM management parameters for
re-establishing and removing a PVC connection.
Use the up-count argument to specify the number of consecutive
end-to-end F5 OAM loopback cell responses that must be
received in order to change a PVC connection state to up. Use the
down-count argument to specify the number of consecutive
end-to-end F5 OAM loopback cell responses that are not received
in order to tear down a PVC. Use the retry-frequency argument to
specify the frequency (in seconds) at which end-to-end F5 OAM
loopback cells should be transmitted when a change in
UP/DOWN state is being verified. For example, if a PVC is up
and a loopback cell response is not received after the frequency
(in seconds) specified using the oam-pvc command, then
loopback cells are sent at the retry-frequency to verify whether or
not the PVC is down.

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OAM Management
By default, end-to-end F5 OAM loopback cell generation is turned off for each PVC. A PVC is
determined as down when any of the following is true on that PVC:
•The router does not receive a loopback reply after a configured number of retries of sending
end-to-end F5 OAM loopback cells.
•The router receives a Virtual Circuit-Alarm Indication Signal (VC-AIS) cell.
The router receives a Virtual Circuit-Remote Detect Indicator (VC-RDI) cell.
A PVC is determined as up when all the following are true on that PVC:
•The router receives a configured number of successive end-to-end F5 OAM loopback cell replies.
•The router does not receive VC-AIS cell for 3 seconds.
•The router does not receive VC-RDI cell for 3 seconds.
Note the following regarding OAM management:
•When OAM management is not enabled, loopback (LB) cells received by the PVC are looped back
to the sender, and for any received F4/F5-AIS, F4/F5-RDI cells are transmitted via this PVC, but the
PVC state is not changed.
The 4-Port ATM ISE line card supports OAM management enabled mode for the entire range of VCs
supported, while using the default frequency of 10 seconds on all VCs. The minimum OAM LB cell
frequency of 1 second is currently permitted over no more then 50 PVCs (chassis performance
limitation), and the default interval of 10 seconds is used for the rest of the PVCs.
OAM F5 Continuity Check
The 4-Port ATM ISE line card also provides OAM support for the use of F5 segment and end-to-end
continuity check (CC) cells to detect connectivity failures at the ATM layer. It also generates various
Simple Network Management Protocol (SNMP) notifications when CC cells indicate virtual circuit (VC)
connectivity failure
ATM OAM F5 CC cells provide an in-service tool optimized to detect connectivity problems at the VC
level of the ATM layer. CC cells are sent between a router designated as the source location and a router
designated as the sink location. The local router can be configured as the source, the sink, or both.
Step 7 oam-pvc manage cc {end | segment}
[direction {both | sink | source}]
[keep-vc-up [end aisrdi failure | seg
aisrdi failure]]
Example:
Router(config-if-atm-vc)# oam-pvc manage
cc segment direction source
Configures ATM OAM F5 continuity check (CC) management to
detect connectivity failures at the ATM layer.
Step 8 oam retry cc {end | segment}
[activation-count [deactivation-count
[retry-frequency]]]
Example:
Router(config-if-atm-vc)# oam retry cc
segment 10 10 30
Configures the retry count and the frequency at which CC
activation and deactivation requests are sent to the device at the
other end of the PVC or the segment.
Command or Action Purpose

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The 4-Port ATM ISE line card implements two types of OAM cells: CC cells for fault management and
CC cells for activation and deactivation. Fault management cells detect connectivity failures. Activation
and deactivation cells initiate the activation or deactivation of continuity checking.
Configuring Quality of Service on Terminated VCs
Quality of Service (QoS) on terminated VCs is configured using the Modular QoS CLI (MQC). MQC
allows users to create traffic policies and attach these policies to interfaces. A traffic policy contains a
traffic class and one or more QoS features. A traffic class is used to classify traffic, and the QoS features
in the traffic policy determine how to treat the classified traffic.
To configure and enable QoS on terminated VCs, you must define a traffic class, create a traffic policy,
and attach this traffic policy to the PVC. See the “Configuring Modular QoS CLI” section on page 84
for detailed instructions on how to complete these tasks.
The following tasks use the MQC to configure QoS on terminated VCs:
•Configuring Traffic Policing, page 14
•Configuring a Per-VC Queue Limit, page 16
•Configuring Per-VC WRED, page 18
•Configuring Per-VC MDRR and Low Latency Queueing, page 20
•Configuring the set Commands, page 23
•Troubleshooting Tips, page 27
Configuring Traffic Policing
This task describes how to configure traffic policing using the MQC. Traffic policing can be configured
for either ingress or egress traffic.
This task illustrates the use of the match access-group command. For information on other match
options, refer to the “Configuring Modular QoS CLI” section on page 84.
When traffic policing is configured, packets coming into interface are evaluated by the token bucket
algorithm to determine whether they conform to or exceed the specified parameters. The
conform-action, exceed-action, and violate-action parameters in the police command determine what
is done with the packets.
SUMMARY STEPS
1. enable
2. configure terminal
3. class-map class-map-name
4. match access-group access-group
5. exit
6. policy-map policy-name
7. class class-name
8. police bps burst-normal burst-max conform-action action exceed-action action violate-action
action
9. exit

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10. exit
11. interface atmslot/port.subifnum
12. pvc vpi/vci
13. service-policy {input | output} policy-name
DETAILED STEPS
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 class-map class-map-name
Example:
Router(config)# class-map acgroup2
Specifies the user-defined name of the traffic class.
Step 4 match access-group access-group
Example:
Router(config-cmap)# match access-group 2
Specifies the numbered access list against whose contents
packets are checked to determine if they belong to the class.
Step 5 exit Exits class-map mode.
Step 6 policy-map policy-name
Example:
Router(config)# policy-map police
Specifies the name of the traffic policy to configure.
Step 7 class class-name
Example:
Router(config-pmap)# class acgroup2
Specifies the name of a predefined class, which was defined
with the class-map command, to be included in the traffic
policy.
Step 8 Router(config-pmap-c)# police bps burst-normal
burst-max conform-action action exceed-action
action violate-action action
Example:
Router(config-pmap)# police 8000 2000 4000
conform-action transmit exceed-action
set-qos-transmit 4
Specifies a maximum bandwidth usage by a traffic class
through the use of a token bucket algorithm.
Step 9 exit Exits policy-map class mode.
Step 10 exit Exits policy-map mode

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The command syntax of the police command allows you to specify the action to be taken on a packet
when you enable the action keyword. The actions resulting from the keyword choices are listed in
Table 5.
Configuring a Per-VC Queue Limit
Use this task to configure a per-VC queue limit on a single egress or ingress queue.
Restrictions
A queue limit cannot be configured together with WRED.
Step 11 interface atmslot/port.subifnum
Example:
Router(config)# interface atm1/0.1
Specifies the ATM subinterface to configure.
Step 12 pvc vpi/vci
Example:
Router(config-subif)# pvc 10/50
Specifies the ATM PVC to attach the traffic policy to.
Step 13 service-policy {input | output}policy-name
Example:
Router(config-if-atm-vc)# service-policy input
police
Attaches the traffic policy to the PVC.
Command or Action Purpose
Table 5 police Command Action Keywords
Keyword Resulting Action
drop Drops the packet.
set-clp-transmit Sets the ATM CLP bit and sends the packet. This is supported
for egress only.
set-discard-class-transmit
new-class
Sets the discard-class and sends the packet. This is supported for
ingress on terminated VCs only.
set-dscp-transmit dscp Sets the differentiated services code point (DSCP) value and
sends the packet.
set-mpls-exp-imposition-transmit
mpls-exp
Sets the experimental value at tag imposition and sends the
packet. This is supported for ingress on terminated VCs only.
set-mpls-exp-topmost-transmit
mpls-exp
Sets the experimental value on the topmost label and sends the
packet. This is supported on terminated VCs only.
set-prec-transmit new-prec Sets the IP precedence and sends the packet.
set-qos-transmit new-qos Sets the QoS group and sends the packet. This is supported for
ingress only.
transmit Sends the packet.

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SUMMARY STEPS
1. enable
2. configure terminal
3. policy-map policy-name
4. class class-default
5. queue-limit cells cells (for egress queue) or queue-limit packets packets (for ingress queue)
6. exit
7. exit
8. interface atmslot/port.subifnum
9. pvc vpi/vci
10. service-policy {input | output} policy-name
DETAILED STEPS
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 policy-map policy-name
Example:
Router(config)# policy-map qlimit1
Specifies the name of the traffic policy to configure.
Step 4 class class-default
Example:
Router(config-pmap)# class class-default
Specifies to configure the default class.
Step 5 queue-limit cells cells
or
queue-limit packets packets
Example:
Router(config-pmap-c)# queue-limit 576 cells
Specifies the maximum number of cells or packets queued
for a traffic class that has a bandwidth configuration or
class-default specified. Ingress queues are defined in
packets and egress queues are defined in cells.
Step 6 exit Exits policy-map class mode.
Step 7 exit Exits policy-map mode.

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Configuring Per-VC WRED
Use this task to configure DSCP-based or precedence-based WRED on a VC. WRED can be configured
on both ingress or egress queues, where ingress queues are defined in terms of packets and egress queues
are defined in terms of cells.
Restrictions
•Random-detect cannot be configured on a class that has priority configured.
•No more than three different Random Early Detection (RED) profiles can be configured on one class
of service (COS) queue.
SUMMARY STEPS
For precedence-based WRED use Step 7; for DSCP-based WRED use Step 8 or Step 9.
1. enable
2. configure terminal
3. policy-map policy-name
4. class class-name
5. random-detect
6. random-detect exponential-weighting-constant n
7. random-detect precedence precedence min-threshold {cells | packets}max-threshold {cells |
packets} [mark-prob-denominator]
8. random-detect dscp-based
9. random-detect dscp dscpvalue min-threshold {cells | packets} max-threshold {cells | packets}
[mark-probability-denominator]
10. exit
11. exit
12. interface atmslot/port.subifnum
Step 8 interface atmslot/port.subifnum point-to-point
Example:
Router(config)# interface atm4/0.1
Specifies the ATM subinterface to configure.
Step 9 pvc vpi/vci
Example:
Router(config-subif)# pvc 4/11
Specifies the ATM PVC to attach the traffic policy to.
Step 10 service-policy {input | output} policy-name
Example:
Router(config-if-atm-vc)# service-policy output
qlimit1
Attaches the traffic policy to the PVC.
Command or Action Purpose

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13. pvc vpi/vci
14. service-policy output policy-name
DETAILED STEPS
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 policy-map policy-name
Example:
Router(config)# policy-map wred-1
Specifies the name of the traffic policy to configure.
Step 4 class class-name
Example:
Router(config-pmap)# class class1
Specifies to configure the first class.
Step 5 random-detect Enables a weighted random early detection (WRED) drop
policy for a traffic class that has a bandwidth configuration
or class-default specified.
Step 6 random-detect exponential-weighting-constant n
Example:
Router(config-pmap-c)# random-detect
exponential-weighting-constant 10
Configures a WRED exponential weighting constant on a
per-COS-queue basis.
Step 7 random-detect precedence precedence
min-threshold {cells | packets}max-threshold
{cells | packets}[mark-prob-denominator]
Example:
Router(config-pmap-c)# random-detect precedence
4 500 cells 1100 cells 1
Specifies the minimum and maximum cell thresholds and,
optionally, the mark-probability denominator for the
precedence value.
Specify cells for egress and packets for ingress.
Note Use this step to configure precedence-based
WRED.
Step 8 random-detect dscp-based Indicates that WRED is to use the DSCP value when it
calculates the drop probability for the packet.
Note Use this step to configure DSCP-based WRED.

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Configuring Per-VC MDRR and Low Latency Queueing
This task configures egress MDRR.
Using egress MDRR, the 4-Port ATM ISE line card supports up to eight queues for classes of traffic per
VC. One of the queues is always reserved for a special class called class-default. Up to seven of the
classes are normal queues, including the class-default queue. The eighth class is always a low latency
queue.
The class, class-default, is always configured, and it consumes one of the eight queues. If not configured
explicitly, it is configured implicitly. When the bandwidth command is used, at least 1 percent of traffic
must be reserved for the class-default queue. All packets that do not match any user-defined class on the
policy map are considered to belong to class-default, and therefore enter the default queue.
The low latency queue, or priority queue, is also always created. All traffic sourced from the router
(including ping traffic and multicast traffic) uses this queue, regardless of classification.
Bandwidth percentages are converted into weights in units of ATM cells. The weights are internally
proportioned such that the bandwidth is divided accurately among VCs.
The following are recommendations for configuring per-VC MDRR on the 4-Port ATM ISE line card:
•Set the bandwidth to be at least 10 percent in each class. The default class, class-default, should also
have at least 10 percent of the bandwidth allocation; therefore, you should ensure that the bandwidth
allocated to all configured classes is less that 90 percent.
Step 9 random-detect dscp dscpvalue min-threshold
{cells | packets}max-threshold {cells |
packets} [mark-probability-denominator]
Example:
Router(config-pmap-c)# random-detect dscp 1 300
cells 700 cells 1
Specifies the minimum and maximum cell thresholds and,
optionally, the mark-probability denominator for the DSCP
value.
Specify cells for egress and packets for ingress.
Note Use this step to configure DSCP-based WRED.
Step 10 exit Exits policy-map class mode.
Step 11 exit Exits policy-map mode.
Step 12 interface atmslot/port.subifnum
Example:
Router(config)# interface atm1/0.1
Specifies the ATM subinterface to configure.
Step 13 pvc vpi/vci
Example:
Router(config-subif)# pvc 1/1
Specifies the ATM PVC to attach the policy map to.
Step 14 service-policy output policy-name
Example:
Router(config-if-atm-vc)# service-policy output
wred-1
Attaches the policy map to the PVC.
Command or Action Purpose