Cisco Bug: CSCvv34847 - traffic black-holing after remove add of member, l2port and extlif entries are not programmed on LC
Sep 03, 2020
- Cisco Network Convergence System 5500 Series
Known Affected Releases
Symptom: In a VPWS case (AC and PW) with bundle as AC with members spanning across different line cards, removal of last bundle member from a particular LC leads the system to s/w database inconsistency. Any further operation done - bundle member add/update leads to unknown failures. Below is one such scenario where this condition leads to traffic loss: Traffic drop will be seen on a bundle member, where the bundle has members across multiple LC's and last member is removed and added back. Example: Bundle BE1201 with 2 members from LC5 and LC7. Now remove the member from LC7 and add it back to the bundle. Traffic flowing via LC7 will get dropped. Conditions: Platform: ncs5500 - Modular chassis with multiple linecards. LC : J+/J2 Image: 7.2.1 Bundle AC: Members from more than 1 LC Trigger: Remove last member from one LC, add it back to different bundle or same bundle. * Bundle has to be part of Attachment circuit and VPWS enabled. * Issue will not be seen if local xconnect or local bridging.
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