Hi Everyone,
We have had an issue for the past 2 weeks, where randomly OSPF+LDP sessions(But
not all sessions) would drop for ~3-9 seconds on an ASR1006. Any link connected
directly to the ASR was not experiencing any issues....only links going via a
4948(Only doing L2) were being impacted.
To further eliminate the ASR, we moved one of the links that was experiencing
the OSPF/LDP flaps from the 4948 directly to the ASR....flaps stopped occurring
for this link.
TAC have been working on the problem for over a week, and Friday identified
that the flaps were coinciding with TCN's on the 4948 - There suggestion was to
enable "spanning-tree portfast trunk" on the link from the 4948 -> ASR....this
was done, and we havent experienced a flap for over 2 days(But we have gone for
2-3 days, without a flap previously)
Ive asked TAC (But they have yet to respond to my question), so Im hoping
someone on the list can:
Is it expected behaviour for a TCN to cause a flap on an ASR...We have many
other POP's with switches 4948's/4500's etc(trunk)->ASR+7200's and do not have
spanning-tree portfast trunk enabled, and they do not experience any flaps?
Is enabling spanning-tree portfast trunk on the 4948 trunk port to the ASR
simply stopping the TCN's from getting to the ASR, and therefore stopping the
flaps....but we still have (a yet to be identified) issue?
Thanks in advance for any suggestions/comments.
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