Nortel 5000 Series Release Notes page 34

34 Known issues and limitations
Change Request
Number
Q01728586
Q01731450
Q01736809
Q01737603
Q01736807
Q01737679
Copyright © 2008., Nortel Networks
.
Description
There are 4 internal ports for two Cascade links. Internal ports 1 and 2 are
associated with Cascade-Down link and internal ports 3 and 4 are associated
with Cascade-Up link.
•
Message Stack port 1 DOWN or Stack port 2 DOWN means
Cascade-Down link is down.
• Message Stack port 1 UP or Stack port 2 UP means
Cascade-Down link is down.
• Message Stack port 3 DOWN or Stack port 4 DOWN means
Cascade-Up link is down.
• Message Stack port 3 UP or Stack port 4 UP means
Cascade-Up link is down.
The OSPF neighbor state intermittently remains in Exch Strt when routing
is disabled and enabled for an ABR with virtual link configured.
Workaround: To return the OSPF neighbor to the full state; disable then
re-enable routing.
To enable IPSG, you must enable both DHCP Snooping and Arp Inspection
on the switch and configure the port as untrusted.
The correct way to log out of the Web-based management interface is to
go to the main menu and choose Administration > Logout. If you close
the browser window, you will be unable to log back into the Web-based
management interface for the configured idle period.
To confirm that there are sufficient filter or mask resources available for you
to enable IPSG, use the show qos diag command to display the filter and
mask resource use by a port that is a member of a QoS interface group. The
number of QoS plus nonQoS masks cannot exceed a total of 15 for each port
as there are only 15 available masks on the DUT. Also, the number of QoS
plus nonQos rules cannot exceed a total of 128 for each port
In an SMLT environment, the traffic received on an IST port is categorized
into two groups: IST switched and routed packets. To prevent a loop
condition, the switch must block IST switched packets (broadcast, multicast,
and unknown unicast traffic) from egressing to any SMLT or SLT ports.
However, SMLT switch must be able to forward IST routed packets to any
specific SMLT or SLT port as requested by the routing engine. A hardware
limitation, ERS55xx blocks both IST switched and routed packets from exiting
SMLT or SLT ports. As a result, some of the L3 traffic will be lost. When
you configure ERS55xx with both SMLT and L3 dynamic routing protocols
(OSPF, RIP), you must avoid the topology in which the L3 traffic received on
an SMLT switch is routed to the other SMLT peer because it is a better route.
Nortel Ethernet Routing Switch 5000 Series
Release Notes — Release 6.0
NN47200-400 04.01 Standard
6.0 12 December 2008