Technical data

Known limitations and considerations in this release 45

Release Notes for the Passport 8600 Release 3.7.6

• If a DS3 ATM MDA is not seated properly on the ATM module baseboard,

DS3 port status, port administrative status and port LED status may appear in

an “up” states, however, the PVCs may remain in a down state.

For troubleshooting purposes, use these suggested steps to verify if the MDA

is properly seated (once the F5-OAM loopback feature is enabled, it can be

used to detect such conditions):

1 Create an STG on the switch or use an existing group.

2 Create a VLAN under this STG group.

3 Add ATM ports to this STG and VLAN.

4 Create a PVC executing the CLI command:

config atm <slot|port> pvc create 0.1.

6 Enable F5-OAM on this PVC (0.1) by executing the CLI command:

config atm <slot|port> pvc f5-oam 0.1 enable

7 Create an ELAN by executing the CLI command:

config atm <slot|port> pvc 1483 bridged create vlan-id

0.1

8 Configure the other end of the link and then execute the CLI command:

sh ports info atm f5 <slot|port>

This verifies that the PVC is up. If the PVC is not up, remove the MDA,

and then reseat and refasten it. (Q00539342)

Layer 2

LACP limitations

STP limitations

• In some rare cases, when you enable the perform-tag flag on a MLT, the

status reported by the CLI command

show STP status is incorrect.

Caution: The fast periodic time value of 200 ms is not supported for

this software release. The minimum supported fast periodic time value is

400 ms. (Q00834573)