Technical data

Known limitations and considerations in this release 49
Release Notes for the Passport 8600 Release 3.7.6
• If you use LACP in an SMLT/Square configuration, LACP must have the
same keys for that SMLT/LAG (Link Aggregation Group). Otherwise, the
aggregation may fail if a switch failure occurs. Nortel Networks recommends
that the same key be used for the two devices participating in the SMLT/LAG.
Also, the two devices participating in the SMLT/LAG must have the same
LACP port configuration values for system-priority, timeout, and mode.
(Q00789437)
• If OSPF is enabled, do not set the LACP periodic transmission timer to less
than one second. (Q00787821)
• If you have two switches, A in Active mode and B in Passive mode, when you
change the status of the Active switch to Passive, re-convergence takes
approximately 90 seconds. During this time, traffic from switch B to switch A
is sent for up to 90 seconds, but is not received by switch A. No traffic is sent
from switch A to switch B. (Q00821166)
• In a core full meshed environment using RSMLT, HA, LACP, and VRRP
(edge), if a HA transition occurs (CPU transition from master to backup) or if
the IST link goes down, then all the LACP ports transition. (Q00836591)
• To correctly enable tagging in LACP applications, you disable LACP on the
port, enable tagging on the port, and then re-enable LACP. (Q00859567)
• When more than 2000 ARP entries are learned on a single port, port link
changes (either up or down) may cause time-sensitive protocols, such as
VRRP or LACP, to change states on other ports. (Q00890785)
• If an SMLT aggregation switch has LACP enabled on some of its MLTs, do
not change LACP system priority after LACP is enabled on ports. If some
ports do not get into desired MLT after dynamic configuration change, enter
the CLI command
clear-link-aggregation on the MLT. (Q00822182)
• LACP-enabled ports with the same key must have the same VLAN
membership. On LACP-disabled ports with the same key, VLAN
membership can be different. This usually happens when you add VLANs to
or delete VLANs from these ports. But before LACP is re-enabled on these
ports, VLAN membership must be the same for ports with the same key.
(Q00857570)
• If you set the broadcast rate limit value on a disabled MLT port, the value is
reflected on the other MLT ports, but the rate limiting of the active link is still
done based on the older value. For example, if you have two ports with a rate
limit value of 10, then the active link limits broadcast to 10. If one of the MLT
ports is disabled, the other one becomes the active link and continues to limit