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[ScreenOS] What is the meaning of 'frame dropped: a duplicate rcved from…' messages?

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Article ID: KB30934 KB Last Updated: 25 Sep 2020Version: 2.0
Summary:

This article explains the reason and impact of the following message:

## 2016-05-18 12:10:31 : frame dropped: a duplicate rcved from 21 vs. 7, type 0x2, msg flag 0x0

 

Symptoms:

Running 'debug nsrp all' returns the following output on both master and backup nodes:

Master Node:

## 2016-05-18 12:10:31 : frame dropped: a duplicate rcved from 21 vs. 7, type 0x2, msg flag 0x0
## 2016-05-18 12:10:31 : frame dropped: a duplicate rcved from 7 vs. 21, type 0x2, msg flag 0x2

Backup node:

## 2016-05-18 12:10:31 : frame dropped: a duplicate rcved from 7 vs. 21, type 0x2, msg flag 0x2
## 2016-05-18 12:10:31 : frame dropped: a duplicate rcved from 21 vs. 7, type 0x2, msg flag 0x0

What is the reason and impact of these messages?

 

Solution:

The message, 'frame dropped: a duplicate rcved from' is seen when control & data links of two NSRP nodes are cross connected. In this case, if a secondary-path is not configured, NSRP cluster may go into split brain, impacting the network traffic.

If a secondary-path is configured, NSRP cluster does not go into split brain, but failback mechanism is impacted as follows:

  • When the NSRP master goes down, failover happens quickly

  • When the original master comes back up and preempt is configured, the failback mechanism takes 30-35 minutes.

Correcting the cable connections will resolve all the unexpected behaviors on NSRP cluster.

 

Modification History:

2020-09-25: Article checked for accuracy; article valid and accurate; no changes made

 

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