H3C S3610 Series User manual

Operation Manual – Cluster Management
H3C S3610&S5510 Series Ethernet Switches Table of Contents
i
Table of Contents
Chapter 1 Cluster Management Configuration........................................................................... 1-1
1.1 Cluster Management Overview .........................................................................................1-1
1.1.1 Defining Cluster....................................................................................................... 1-1
1.1.2 Roles in a Cluster....................................................................................................1-2
1.1.3 How a Cluster Works ..............................................................................................1-3
1.2 Configuring a Cluster.........................................................................................................1-6
1.3 Configuring the Management Device................................................................................1-7
1.3.1 Enabling NDP Globally and for Specific Ports........................................................1-7
1.3.2 Configuring NDP Parameters..................................................................................1-7
1.3.3 Enabling NTDP Globally and for Specific Ports......................................................1-8
1.3.4 Configuring NTDP Parameters ...............................................................................1-8
1.3.5 Enabling the Cluster Function.................................................................................1-9
1.3.6 Establishing a Cluster .............................................................................................1-9
1.3.7 Configuring Member Management........................................................................1-12
1.3.8 Configuring Topology Management......................................................................1-14
1.3.9 Configuring Cluster Parameters............................................................................1-15
1.3.10 Configuring Interaction for a Cluster...................................................................1-16
1.4 Configuring the Member Devices....................................................................................1-17
1.4.1 Enabling NDP Globally and for Specific Ports......................................................1-17
1.4.2 Enabling NTDP Globally and for Specific Ports.................................................... 1-17
1.4.3 Enabling the Cluster Function...............................................................................1-17
1.4.4 Adding a Candidate Device to a Cluster...............................................................1-17
1.5 Displaying and Maintaining Cluster Management...........................................................1-17
1.6 Cluster Management Configuration Example..................................................................1-18

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Chapter 1 Cluster Management Configuration
1.1 Cluster Management Overview
1.1.1 Defining Cluster
Acluster is an aggregation of a group of communication devices. Cluster management
is to implement management of large numbers of distributed layer 2 devices.
Cluster management is implemented through HGMP v2. By employing huawei group
management protocol (HGMP v2), a network administrator can manage multiple
switches using the public IP address of a switch known as a management device.
Figure 1-1 illustrates a typical cluster implementation.
Management Device
Member Device
Member Device
69.110.1.1
Network Management Device
Cluster
69
Candidate Device
.110.1.100
Network
Member Device
Management Device
Member Device
Member Device
69.110.1.1
Network Management Device
Cluster
69
Candidate Device
.110.1.100
Network
Member Device
Figure 1-1 Network diagram for a cluster
Each cluster has one (and only one) management device. You need to designate the
management device when creating a cluster. The management device of a cluster is
the portal of the cluster. That is, operations performed outside a cluster and intended
for the member devices of a cluster, such as accessing, configuring, managing, and
monitoring a cluster member, are all implemented through the management device.
zThe management device of a cluster identifies and controls all the member
devices in the cluster, regardless of their position and the way they are connected.

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zThe management device collects the topology information about all the cluster
member devices and candidate devices for users to retrieve.
zA management device manages and monitors the cluster member devices based
on the neighbor information collected, which contains network topology
information.
Cluster management offers the following advantages:
zThe procedures to configure multiple switches remarkably simplified. By
configuring a public IPaddress on the management device, you can configure and
manage a group of member devices on the management device without the
trouble of logging onto each device separately.
zProviding topology discovery and display function, which is useful for network
monitoring and debugging
zAllowing simultaneously software upgrading and parameter configuring on
multiple switches
zFree of topology and distance limitations
zSaving public IP address resource
1.1.2 Roles in a Cluster
The switches in a cluster play different roles. They function differently and are thus in
different status. You can specify the role a switch plays. A switch can switch to other
roles according to specific rules.
The following three roles exist in a cluster: management device, member device, and
candidate device.
Table 1-1 Roles in a cluster
Role Configuration Function
Management device
zConfigured with the
public IP address of the
cluster
zManagement
commands intended for
a cluster are processed
by the management
device
zA management device
provides an interface for
managing all the devices
in the cluster.
zA management device
manages the member
devices through NAT.
zA management device
provides these functions:
collecting neighbor
information and topology
information of the
network, managing the
entire cluster, maintaining
the cluster. It also
supports proxies.

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Role Configuration Function
Member device A member device does not
own the public IP address
of the cluster.
zMembers in the cluster
zAmember device is under
the management of the
management device. It
discovers neighbor
information, carries out
the commands passed by
proxies, and reports
faults/log.
Candidate device A candidate device does
not own the public IP
address of the cluster.
Acandidate device refers to a
switch that does not belong
to any cluster but has the
cluster capability.
As shown in the following figure, a device in a cluster changes its role according to
specific rules:
Figure 1-2 Role change in a cluster
zEach cluster has one (and only one) management device. A management device
collects NDP/NTDP information to discover and determine candidate devices.
zA candidate device becomes a member device after being added to a cluster.
zA member device becomes a candidate device after being removed from the
cluster.
zWhen a user removes a management device, the management becomes a
candidate device.
1.1.3 How a Cluster Works
Cluster management involves topology information collection and the establishment
and maintenance of the cluster. Topology information collection and cluster
maintenance are independent from each other, with the former starting before the
cluster is created:

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zAll devices use neighbor discovery protocol (NDP) to collect the information of the
immediately connected neighbors, including their software version, host name,
MAC address and port number.
zThe management device uses neighbor topology discovery protocol (NTDP) to
collect the information of the devices within the specified hops and the topology
information of all devices and specify the candidate devices of the cluster.
zThe management device adds or deletes a member device and modifies cluster
management configuration.
I. Introduction to NDP
NDP is used to discover the information about directly connected neighbors, including
the device name, software version, and connecting port of the adjacent devices. NDP
works in the following ways:
zAn NDP-enabled device periodically sends NDPpackets containing its information
to its neighbors. An NDP packet carries the holdtime field, which indicates the
period for the receiving devices to keep the NDP data. maintains an NDP
information table. Each entry in an NDP table ages with time. You can also clear
the current NDP information manually to have adjacent information collected
again.
zAn NDP-enabled device also receives NDP packets, storing and maintaining an
NDP table. The corresponding data entry in the NDP table is updated when the
received information is different from the existing one. Otherwise, only the
holdtime of the corresponding entry is updated.
II. Introduction to NTDP
NTDP is a protocol for network topology information collection in a specific network
range, providing the information about the devices that can be added to clusters for a
management device. The management device collects the topology information
periodically or manually:
zThe management device periodically sends NTDP topology collection request
from the NTDP-enabled ports.
zUpon receiving the request, the devices sends NTDPtopology collection response
to the management device, copies this response packet on the NTDP-enable port
and sends it to the directly connected neighbor.
zThe directly connected device performs the same operation until the NTDP
topology collection request is sent to all the devices within specified hops.
When the NTDP topology collection request is advertised in the network, large
numbers of network devices receive the NTDP topology collection request and send
NTDPtopology collection response at the same time, which may cause congestion and
the management device business. To avoid such case, the following methods can be
used to control the NTDP topology collection request advertisement speed:

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zUpon receiving an NTDP topology collection request the device does not forward
the NTDP topology collection request, instead, it waits for a period of time and
then forwards the NTDP topology collection request on the first NTDP-enabled
port.
zOn the same device, except the first port, each NTDP-enabled port waits for a
period of time and then forwards the NTDP topology collection request after the
port before it sends the NTDP topology collection request.
III. Introduction to handshake packets
Handshake packets are used to maintain status of the members in a cluster.
zThe member devices and the management device in a cluster send handshake
packets to each other periodically. In response to a received handshake packet,
the management device or a member device simply remains its active state
without any acknowledgement.
zIf the management device does not receive the handshake packets from a
member device for three consecutive times, it changes the status of the member
device from active to connect. Likewise, if a member device fails to receive the
handshake packets from the management device for three consecutive times, the
status of the member device will also be changed from active to connect. You can
use the timer command in cluster view on the management device to configure
the interval to send handshake packets. The system default is 10 seconds.
zAmember device in the connect state changes to the disconnect state if it does not
receive a handshake packet or a management packet within the holdtime. In this
case, the management device considers that the member device is disconnected.
You can set the holdtime by executing the holdtime command in the cluster view
on the management device (the system default is 60 seconds). The active state
and connect state indicate that a member device is connected.
Besides, the handshake packets are also used to inform the management device when
topology changes occur on neighboring devices.

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1.2 Configuring a Cluster
Table 1-2 HGMPv2 configuration tasks
Configuration task Description Related sections
Enabling NDP globally and for
specific ports Required 1.3.1 “Enabling
NDP Globally and
for Specific Ports”
Configuring NDP parameters Optional 1.3.2 “Configuring
NDP Parameters”
Enabling NTDP globally and
for specific ports Required 1.3.3 “Enabling
NTDP Globally and
for Specific Ports”
Configuring NTDP parameters Optional 1.3.4 “Configuring
NTDP Parameters”
Enabling the cluster function Required 1.3.5 “Enabling the
Cluster Function”
Establishing a cluster Required 1.3.6 “Establishing
a Cluster”
Configuring member
management Required 1.3.7 “Configuring
Member
Management”
Configuring topology
management Optional 1.3.8 “Configuring
Topology
Management”
Configuring cluster
parameters Optional 1.3.9 “Configuring
Cluster
Parameters”
Configuring
the
management
device
Configuring interaction for a
cluster Optional
1.3.10
“Configuring
Interaction for a
Cluster”
Enabling NDP globally and for
specific ports Required 1.4.1 “Enabling
NDP Globally and
for Specific Ports”
Enabling NTDP globally and
for specific ports Required 1.4.2 “Enabling
NTDP Globally and
for Specific Ports”
Enabling the cluster function Required 1.4.3 “Enabling the
Cluster Function”
Configuring
the member
devices
Adding a candidate device to
a cluster Optional 1.4.4 “Adding a
Candidate Device
to a Cluster”

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Caution:
If you disable the NDP and NTDP functions on the management device and member
devices after creating a cluster, you will not cause the cluster to be dismissed, but will
influence the normal operation of the cluster.
1.3 Configuring the Management Device
1.3.1 Enabling NDP Globally and for Specific Ports
Follow these steps to enable NDP globally and for specific ports:
To do... Use the command... Remarks
Enter system view system-view -
Enable NDP globally ndp enable Optional
Enabled by default.
In system
view ndp enable
interfaceinterface-list
interface interface-type
interface-number
Enable the
NDP
feature for
the port(s) In Ethernet
port view ndp enable
Use either command
By default, NDP is
enabled globally and
also on all ports.
Caution:
For NDP to work normally, you must enable NDP both globally and on the specified
port.
1.3.2 Configuring NDP Parameters
Follow these steps to configure NDP parameters:
To do... Use the command... Remarks
Enter system view system-view —
Configure the holdtime of
NDP information ndp timer aging
aging-time
Optional
By default, the NDP
information holdtime is 180
seconds.

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To do... Use the command... Remarks
Configure the interval to
send NDP packets
ndp timer hello
hello-time
Optional
By default, the interval of
sending NDP packets is 60
seconds.
1.3.3 Enabling NTDP Globally and for Specific Ports
Follow these steps to enable NTDP globally and for specific ports
To do... Use the command... Remarks
Enter system view system-view —
Enable NTDP globally. ntdp enable Optional
Enabled by default
interface interface-type
interface-number
Enable NTDP for the port
ntdp enable
Optional
Enabled by default
Caution:
zTo enable NTDP to work normally, you must enable NTDP both globally and on the
specified port.
zThe NTDP function is not compatible with the BPDU Tunnel function on a port. So,
do not enable the both on a port at the same time. For information about BPDU
Tunnel, refer to QinQ-BPDU Tunnel Configuration of this manual.
1.3.4 Configuring NTDP Parameters
Follow these steps to configure NTDP parameters:
To do... Use the command... Remarks
Enter system view system-view —
Configure the range within
which topology
information is to be
collected
ntdp hop hop-value
Optional
By default, the hop range
for topology collection is 3
hops.

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To do... Use the command... Remarks
Configure the interval to
collect topology
information ntdp timer interval-time
Optional
By default, the interval to
collect topology
information is 1 minute.
Configure the delay to
forward
topology-collection
request packets
ntdp timer hop-delay
time
Optional
By default, the delay of
the device is 200 ms.
Configure the port delay to
forward topology
collection request packets
ntdp timer port-delay
time
Optional
By default, the port delay
is 20 ms.
Exit system view quit —
Enable topology
information collecting ntdp explore Optional
Note:
The ntdp command is not compatible with the bpdu-tunnel enable command. So, do
not configure them at the same time. For information about BPDU Tunnel, refer to
QinQ-BPDU Tunnel Configuration of this manual.
1.3.5 Enabling the Cluster Function
Follow these steps to enable the cluster function:
To do... Use the command... Remarks
Enter system view system-view —
Enable the cluster
function globally cluster enable Optional
By default, the cluster
function is enabled.
1.3.6 Establishing a Cluster
Before establishing a cluster, you need to configure a private IP address pool for the
devices to be added to the cluster. When a candidate device is added to a cluster, the
management device assigns a private IP address to it for the candidate device to
communicate with other devices in the cluster. This enables you to manage and
maintain member devices in a cluster through the management device.