Allied Telesis AR4155 Instruction Manual

Software Maintenance Release Note
Version 281-01
for AR700, AR415S, AR450S and AR44x series routers, and
AT-8600, AT-8700XL, Rapier i, AT-8800, AT-8900, x900-48, AT-9900, and AT-9800 series switches
This software maintenance release note lists the issues addressed and enhancements made in Maintenance Version 281-01 for Software Version 2.8.1. Version
details are listed in the following table:
Models Series Release File Date Size (bytes) GUI file
AR415S, AR440S, AR441S, AR442S, AR450S AR400 54281-01.rez 26 July 2006 4672392 415s_281-01_en_d.rsc
440s_281-01_en_d.rsc
441s_281-01_en_d.rsc
442s_281-01_en_d.rsc
450s_281-01_en_d.rsc
AR750S, AR770S 55281-01.rez 26 July 2006 3934152 750s_281-01_en_d.rsc (AR750S)
AR725, AR745 AR7x5 52281-01.rez 26 July 2006 3999360 725_281-01_en_d.rsc
745_281-01_en_d.rsc
AT-8624T/2M, AT-8624PoE, AT-8648T/2SP AT-8600 sr281-01.rez 26 July 2006 2249768 sr24_281-01_en_d.rsc
AT-8724XL, AT-8748XL AT-8700XL 87281-01.rez 26 July 2006 2292712 8724_281-01_en_d.rsc
8748_281-01_en_d.rsc
Rapier 24i, Rapier 48i, Rapier 16fi Rapier i 86281-01.rez 26 July 2006 4417996 r24i_281-01_en_d.rsc
r16i_281-01_en_d.rsc
r48i_281-01_en_d.rsc
AT-8824, AT-8848 AT-8800 86281-01.rez 26 July 2006 4417996 8824_281-01_en_d.rsc
8848_281-01_en_d.rsc

Enabling and Installing this Release 2
Version 281-01
C613-10482-00 REV A
Caution: Using a maintenance version on the wrong model may cause unpredictable results, including disruption to the network.
This maintenance release note should be read in conjunction with the Release Note for Software Version 2.8.1.
Caution: Information in this release note is subject to change without notice and does not represent a commitment on the part of Allied Telesis Inc. While every
effort has been made to ensure that the information contained within this document and the features and changes described are accurate, Allied Telesis Inc. can
not accept any type of liability for errors in, or omissions arising from the use of this information.
Enabling and Installing this Release
To use this maintenance release you must have a base release license for Software Release 2.8.1. Contact your distributor or reseller for more information. To
enable this release and install it as the preferred release, use the commands:
enable rel=xx281-01.rez num=2.8.1
set install=pref rel=xx281-01.rez
where xx is the prefix to the filename, as shown in the table on page 1. For example, to install the release on an AR440S router, use the commands:
enable rel=54281-01.rez num=2.8.1
set install=pref rel=54281-01.rez
AT-8948, x900-48FE, x900-48FE-N x900-48 89281-01.rez 26 July 2006 4786652 -
AT-9924T, AT-9924SP, AT-9924T/4SP AT-9900 89281-01.rez 26 July 2006 4786652 9924_281-01_en_d.rsc
AT-9812T, AT-9816GB AT-9800 sb281-01.rez 26 July 2006 3865056 9812_281-01_en_d.rsc
9816_281-01_en_d.rsc
Models Series Release File Date Size (bytes) GUI file

Levels 3
Version 281-01
C613-10482-00 REV A
Levels
Some of the issues addressed in this Maintenance Version include a level number. This number reflects the importance of the issue that has been resolved. The
levels are:
Level 1 This issue will cause significant interruption to network services, and there is no work-around.
Level 2 This issue will cause interruption to network service, however there is a work-around.
Level 3 This issue will seldom appear, and will cause minor inconvenience.
Level 4 This issue represents a cosmetic change and does not affect network operation.

Features in 281-01 4
Version 281-01
C613-10482-00 REV A
Features in 281-01
Software Maintenance Version 281-01 includes the resolved issues and enhancements in the following tables. In the tables, for each product series:
■“Y” indicates that the resolution is available in Version 281-01 for that product series.
■“-” indicates that the issue did not apply to that product series.
Level 1
CR Module Level Description
AR400 AR7x5 AR750S / AR770S Rapier i AT-8800 AT-8600 AT-8700XL AT-8948 / x900-48 AT-9900 AT-9800
CR00012654 Switch 1 If an AT-9924SP had a large number of SFPs installed and had a very high level of
traffic passing through the network, sometimes newly inserted SFPs were not
detected.
This issue has been resolved.
--------Y-
CR00012715 DHCP 1 In some configurations in which the DHCP server was enabled, the router or
switch compacted its flash memory frequently. This occurred because the DHCP
server unnecessarily updated record files in flash memory even if the record had
not changed.
This issue has been resolved, so that DHCP records are only updated when
necessary. Note that if the router or switch has NVS memory, it stores DHCP
records in NVS by preference, instead of in flash memory.
YYYYYYYYYY
CR00012760 Log 1 Entering the command show debug caused the router or switch to reboot if one
or more long messages existed in the log.
This issue has been resolved.
YYYYYYYYYY

Features in 281-01 5
Version 281-01
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CR00012933 Switch 1 When STP is enabled on the switch but is disabled for a trunk (by using the
command disable stp port), the trunk should pass traffic. Previously, some trunk
members sometimes stayed in the “discarding” state instead.
This issue has been resolved.
-------YY-
CR00013025 DVMRP 1 Receiving a DVMRP Graft or Prune message occasionally caused the router or
switch to reboot.
This issue has been resolved.
YYYYY- - YYY
CR00013413 IP Gateway,
Load Balancer
1If the router or switch was configured with a local interface IP address and the
interface to which this address belonged did not have a logical interface with
index 0, a number of connectivity issues from this router or switch occurred, in
which the router or switch was not able to communicate with UDP, TCP or PING.
This issue has been resolved.
YYYYYYYYYY
CR00013666 SSL 1 When the router or switch used SSL to process HTTPS traffic, it rebooted.
This issue occurred, for example, when browsing securely to the GUI, or when
the load balancer was configured to support HTTPS traffic.
This issue has been resolved.
YYYYYYYYYY
CR Module Level Description
AR400 AR7x5 AR750S / AR770S Rapier i AT- 8800 AT- 8600 AT-8700XL AT-8948 / x900-48 AT- 9900 AT- 9800

Features in 281-01 6
Version 281-01
C613-10482-00 REV A
Level 2
CR Module Level Description
AR400 AR7x5 AR750S / AR770S Rapier i AT-8800 AT-8600 AT-8700XL AT-8948 / x900-48 AT-9900 AT-9800
CR00009212 Bridge 2 The Bridge cannot be configured to bridge PPPoE packets from an Ethernet
interface that has also been configured as a PPPoE interface. Previously, such a
Bridge configuration would appear to succeed. However the Bridge would not
bridge PPPoE packets and the router would restart when the command reset
bridge was entered.
This issue has been resolved. Note: if you want to bridge PPPoE packets, do not
also configure the router as a PPPoE endpoint (by using the command create
ppp=number over=ethx-any).
YYY- ------
CR00009213 MSTP 2 Because of an MSTP issue, the switch did not always send a BPDU with an
agreement flag to its designated bridge, even if the switch was synchronised with
the latest spanning tree information from the designated bridge. This prevented
the designated port on the designated bridge from making a fast transition to
the forwarding state. The result was that the network could take up to two times
the “forward delay” time to fully converge.
This issue has been resolved.
---YYYYYY-
CR00009826 IP Gateway 2 When a static ARP is deleted, the router or switch sends out an ARP request to
attempt to create a dynamic ARP for that IP address. Previously, the router or
switch did not process the ARP response correctly and therefore did not add the
ARP to its ARP table.
This issue has been resolved. When a static ARP is deleted, the router or switch
attempts to create a dynamic ARP for that IP address, and will successfully add it
to the ARP table if a device responds.
YYYYYYYYYY
CR00010513 BGP,
IP Gateway
2BGP did not update its route table when a blackhole route changed in IP.
This issue has been resolved.
YYYYY- - YYY

Features in 281-01 7
Version 281-01
C613-10482-00 REV A
CR00011434 File 2 The router or switch sometimes rebooted when copying a very large file (several
Mbytes). This issue has been resolved by improving the copy process so that it
uses fewer memory buffers.
YYYYYYYYYY
CR00011670 Switch 2 On x900-48 Series switches, when the switch used a DSCP map to remark
packets, it did not mark the packets correctly.
This issue has been resolved.
-------Y--
CR00012364 IPv6 2 For IPv6, if there were multiple equal cost multipath (ECMP) static routes to a
destination, and one or more links for the routes became inactive, the inactive
route was sometimes still chosen for forwarding. This caused brief data delivery
failure to the destination.
This issue has been resolved.
YYYYY- - YYY
CR00012534 IP Gateway 2 If the router or switch received an IP packet that had been sent as an Ethernet
broadcast, the router or switch responded as if the packet had been sent to its IP
address, even when the packet was destined for a different IP address. In
particular, the router or switch processed and responded to ICMP and TCP
packets that were sent as Ethernet broadcasts to different IP addresses. These
caused the router or switch to send ICMP echo responses or TCP reset packets.
This issue has been resolved. Such Ethernet broadcast packets are generally not
valid packets, so the router or switch now discards them.
YYYYYYYYYY
CR Module Level Description
AR400 AR7x5 AR750S / AR770S Rapier i AT- 8800 AT- 8600 AT-8700XL AT-8948 / x900-48 AT- 9900 AT- 9800

Features in 281-01 8
Version 281-01
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CR00012613 Firewall 2 When the WAN load balancer was used with IP NAT (instead of firewall NAT), and
an FTP session was established to a server on the public network, the router did
not correctly establish a return session. This meant data was unable to flow
correctly back from the server, and the router rebooted.
This issue has been resolved.
Note that the WAN load balancer is not designed for use with IP NAT, because IP
NATs are not associated with interfaces. Configurations that use an IP NAT cannot
vary the global IP address (the gblip parameter) based on the outgoing interface,
so the WAN load balancer sends all traffic out with the same source address.
Therefore, the return traffic probably comes back via the WAN load balancer
resource that is associated with the global IP. The impact is that the WAN load
balancer balances the outgoing traffic but not the return traffic.
We recommend using firewall NAT instead of IP NAT with the WAN load balancer.
Y-Y-------
CR00012624 VRRP,
IP Gateway
2Under certain network conditions in which VRRP entities become temporarily
unsynchronised, the router or switch could receive a gratuitous ARP from a self-
elected VRRP master when the router or switch was still the master. This caused
the existing master to create an ARP entry that incorrectly redirected packets
towards the other VRRP entity even after the other entity had become a slave
again.
This issue has been resolved. The router or switch no longer accepts gratuitous
ARPs from other VRRP entities while it is still the Master.
YYYYYYYYYY
CR00012683 Switch 2 After the AR770S rebooted, the Port Link/Activity and Duplex/Collision LEDs
sometimes did not blink in response to activity and collisions, respectively.
This issue has been resolved. The router detects the problem and recovers from
it, if possible. If it cannot recover from the problem, it generates a log message
of severity 6, module SWK, type REST, and subtype FAIL. The log message says
“An LED error has been detected, please power-cycle the device. If this message
appears again, contact your technical support representative for help.”
--Y-------
CR Module Level Description
AR400 AR7x5 AR750S / AR770S Rapier i AT- 8800 AT- 8600 AT-8700XL AT-8948 / x900-48 AT- 9900 AT- 9800

Features in 281-01 9
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CR00012697 IPsec, ENCO 2 Decrypting a large IPsec ESP packet sometimes caused the router or switch to
reboot.
This issue has been resolved.
YYYYY-----
CR00012710 Core 2 Soft errors can generate exceptions that would cause the router or switch to
reboot. Soft errors are spontaneous changes in the information stored in a digital
circuit, caused by physical effects. The router or switch’s handling of such errors
has been improved, so that it recovers without rebooting when possible.
--Y-------
CR00012741 Core, File,
Stack
2The command create config=filename set did not copy the configuration file
to all switches in the stack, but only saved the file onto the current switch.
This issue has been resolved.
---YYYYYY-
CR00012757 OSPF 2 The router or switch correctly accepted the command add ospf redistribution
protocol=static followed by the command set ospf asexternal=on or nssa.
However, the command create config did not create a valid configuration file
from these commands. If the router or switch used that configuration after a
reboot, it gave the error “Redistribution for specified routing protocol - already
exists” and did not use the user-defined redistribution definition.
This issue has been resolved. The router or switch now correctly saves and uses
the user-defined redistribution definition.
YYYYYYYYYY
CR00012820 DHCP
Snooping,
Switch
2When the switch had two DHCP snooping classifiers applied across all 48 ports,
and maxleases was set to 10 or more on each port, the switch rebooted.
This issue has been resolved.
-------Y--
CR00012821 IP Gateway 2 When adding, deleting or updating subnet routes of a more general route, the
software and hardware IP route tables sometimes became unsynchronised. The
same issue sometimes also occurred when updating ECMP routes. This could
cause the router or switch to forward packets to unexpected next hops.
This issue has been resolved.
---YYYYYYY
CR Module Level Description
AR400 AR7x5 AR750S / AR770S Rapier i AT- 8800 AT- 8600 AT-8700XL AT-8948 / x900-48 AT- 9900 AT- 9800

Features in 281-01 10
Version 281-01
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CR00012846 ASYN, Log 2 The following issues occurred with sending log messages to an asynchronous
port:
■The log messages output on an asynchronous port were corrupt.
■When log messages were output to an asynchronous port, that port was
(correctly) locked. However, the port remained locked after the asynchronous
log output definition was destroyed, and after the log output's destination
was changed from asynchronous to something else.
■It was possible for a user to change the log output destination to an
asynchronous port while the user was logged into the asynchronous port. This
resulted in the user losing access to the command line interface.
■It was possible to create a log output definition with an asynchronous port as
the destination even when another user was logged into that asynchronous
port. This resulted in the other user losing access to the command line
interface.
■If a user changed the log output destination to an asynchronous port and
specified invalid parameters in the command, an error message was displayed
but the new output destination was saved anyway.
■The set command allowed a user to specify an asynchronous port as the
destination without specifying the asynchronous port number. The number
defaulted to asyn0, which may not have been the desired port.
These issues have been resolved.
YYYYYYYYYY
CR00012855 Core 2 If the switch was rebooted at a time when there was a high level of packet traffic
between the switch ports and the switch CPU, then during the reboot process it
was possible for RAM test errors to occur.
This issue has been resolved.
-------YY-
CR00012868 ENCO 2 Entering the command create enco key=number ip=? caused the router or
switch to reboot.
This issue has been resolved.
YYYYYYYYYY
CR Module Level Description
AR400 AR7x5 AR750S / AR770S Rapier i AT- 8800 AT- 8600 AT-8700XL AT-8948 / x900-48 AT- 9900 AT- 9800