Nortel 5000 Series Release Notes page 40

40 Known issues and limitations
Change Request
Number
Q01937764
Q01939961
Q01931881
Q01945517
Q01946719
Q01893913
Q01901336
Q01905825
Q01897761
Q01426394
Q01932595
Copyright © 2008., Nortel Networks
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Description
The rate for multicast traffic on 10 G ports on the 5000 Series can fluctuate
with 120 groups and 240 clients at smaller packet sizes. This is because
10 G ports have multicast rate limiting set to 10 percent by default. If you
increase the allowed rate or disable rate limiting on the 10 G ports, you will
fix the issue.
When you configure multiple port-mirroring instances with MAC-based
address modes, the MAC address table in WEB/CI only displays the MAC
address from the first port mirroring instance.
Do not restart the base unit of a stack that previously forwarded neighboring
ports on an Ethernet Routing Switch 8600. If you restart only the base unit
of the stack, the Spanning Tree neighbor ports may go to Spanning Tree
Blocking state.
Workaround: Restart the entire stack.
Starting with release 6.0, the Ethernet Routing Switch 5000 Series switches
support four SSH sessions. Nortel recommends that you have no more than
two concurrent SSH Console sessions. The remainder of the SSH sessions
are intended for NSNA communication with the SNAS.
The load balance will not take effect on Ethernet Routing Switch 5500 Series
units if the port of the L3 ingress traffic is on the same ASIC with an active
trunk member.
In the PIM mroute table, the number of S, G entries displayed may exceed
the number of supported entries when scaling beyond the supported limits.
The switch cannot forward multicast traffic through Non-Local Static Routes.
The switch does forward multicast traffic through other route types such
as a local next-hop.
TDR tests on a 100 MB-only capable unit do not show the expected results.
There is an inconsistency in showing the TDR results between 56XX units
and 55XX units. On both kind of units the TDR results in the situation from
above will not show the Pair1 and NormalCableLength as expected.
On a 56XX unit, TDR test shows the Pair1Length as 0 Meter. On a 55XX
unit, TDR test shows the Pair1Status as Forced mode, with a much higher
value for Pair1Length than normal.
When you use Device Manager with IGMP, you will see some incorrect
information displayed about ActiveQuerier and QuerierPort fields when you
click VLANs, VLANs, Snoop . This is a known issue.
With nine VRRP instances and overnight traffic, you may observe a single
VRRP bounce.
When you enable IGMP proxy, the display may not show all IGMP groups
on upstream routers. This is a display issue only.
Nortel Ethernet Routing Switch 5000 Series
Release Notes — Release 6.0
NN47200-400 04.01 Standard
6.0 12 December 2008