MRV Communications EM316SW-XY Spezifikationen PDF herunterladen (Seite 51)

Known issues with

firmware v4.7 fdr 35

6.7. EM316GEMX2R issues

6.7.1. Issues on 1:1 redundant-tx-mode

(BZ#: 2675,4098,4070)

Description: It is important to note that 1:1 revertive-mode is not supported. 1:1 non-revertive mode

also has certain issues described in this section. For most applications it is recommended to use 1+1

revertive-mode.

A redundant trunk is used to provide an alternate path for traffic to continue flowing in the event that the

primary trunk becomes disabled. The user may set revertive mode to be on or off (indirectly by using

preferred at the trunk port context). Revertive mode specifies which path is used and preferred after

a broken trunk link has been repaired. When revertive mode is off, the traffic path is not changed after

the repair is made. When revertive mode is on, the traffic path reverts back to the preferred trunk after

the repair is made.

The known issue is that when in 1:1 non-revertive mode, the traffic path may unexpectedly change to the

original trunk, after the repair has been made.

In addition it is also possible that the active trunks on both boards may not match to successfully carry the

traffic. This situation may occur by taking any of the following different actions.

Using CLI command (no)shutdown on the trunk ports.

Physically disconnecting and reconnecting the cable.

Power-cycling the already connected modules.

Suggested Work-Around: If the user wants the traffic to be transferred over a specific trunk, a

command to specify a "preferred" trunk port may be issued. However, since it is recommended to use non-

revertive with 1:1, you may have to use "no preferred" to restore the configuration back to non-revertive.

The user can issue a command to specify a "preferred" trunk port be used to recover the traffic path. Begin

by confirming that the trunk connections are physically coupled correctly. Also, confirm that the select-

link status on ports connecting the trunk are out of sync. This means that you will notice that port 1 on

module 1 will be "active", whereas port 1 on module 2 will be "stand-by". This is the main reason that

the traffic does not flow. Issue the "preferred" command to the desired trunk port. After confirming the

"select-link" status matches, you will see that traffic resumes. After that you can use "no preferred" to

resume operation.

It is strongly recommended that if redundant-tx-mode is 1:1, use non-revertive-mode. Recommended

mode of operation is redundant-tx-mode to be 1+1 with revertive-mode.

Highlighted text in the following screen capture shows the items to pay attention to.

fiberdriver(slot/1.13)# show

Slot: 1.13

Model: EM316GEMX2R

.....

Redundant Tx Mode: 1:1

.....

fiberdriver(slot/1.13)# show redundancy

.....

Port Enable Link LIN Select Link Preferred Revertive

====== ======= ========= ====== =========== ========= =========

1.13.1 enable no Signal enable standby no no

1.13.2 enable no Signal enable active no no

1.13.3 .....

fiberdriver(slot/1.13)#

Customer Impact: Moderate.

Corrective Action: This issue will be addressed in future software upgrades.

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