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Author Topic: ERS 48xx - Port mirroring doesn't work for Tx direction on some ports  (Read 2050 times)

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Offline telecom116

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Just so this doesn't bite you... ;)

Details
On ERS 48xx series switches, it was found that port-mirroring doesn't work on some ports.  The packet capture doesn't show the packets in the transmitted (Tx) direction regressing the ports.  There is no impact on the traffic.

Port-mirroring is a tool commonly used to troubleshoot link or network related issue.  If port-mirroring is used on ERS 48xx with this issue, it could lead to incorrection information about the protocols/applications leading to false diagnosis and root cause analysis.

Problem Clarification
This issue ONLY affects ERS 48xx series switch model. ERS 45xx and ERS 5xxx are not affected by the issue.

On the 4850-xx switches the following ports are affected: Port 3-8, 17-20, 29-32, 41-48 inclusive

On the 4826-xx switches the following ports are affected: Port 3-24 inclusive

On the affected switches, if a port in the ranges shown above is used for either monitoring or mirroring with the port-mirroring in Tx direction, the packet capture will not show the Tx packets sent by CPU.

Cause
Due to an issue with the calculation for the internally used module-id (modID) port-mirroring functionality doesn't work for ports belong to the second modID on these switches.
Solution

Workaround: None
Software solution has been submitted to ERS 48xx 5.7.2 and 5.8.1 releases. 

https://support.avaya.com/ext/index?page=content&id=SOLN265319&group=UG_ENTITLED_CUSTOMER


Offline Dominik

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Re: ERS 48xx - Port mirroring doesn't work for Tx direction on some ports
« Reply #1 on: April 23, 2015, 01:24:41 AM »
Thanks for that information.

A non working Port Mirroring is not very nice. Hopefully Avaya will patch this problem in the near future.

Cheers

Itīs always the networks fault!
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