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Cisco Bug: CSCuo38896 - Standby member bundle maximum-active links 1 process inbound traffic

Last Modified

Oct 24, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

4.3.2.MPLS

Description (partial)

Symptom:
(1) Observe MAC_MOVE counts increment.

?[KRP/0/RSP1/CPU0:asr_9010_clr#show controllers np counters np3 location 0/0/CPU0 | inc MAC

Fri Apr 11 01:02:34.244 dst
?[K  94  RESOLVE_EGR_VPLS_MAC_MOVE_CNT                             27           0
  95  RESOLVE_ING_VPLS_MAC_MOVE_CNT                           3986           9
  97  RESOLVE_AGE_MAC_STATIC_DROP_CNT                         3808           9
 339  RESOLVE_MAC_NOTIFY_CTRL_DROP_CNT                        6736          15
 340  RESOLVE_MAC_DELETE_CTRL_DROP_CNT                           7           0
 504  PARSE_FAB_MACN_RECEIVE_CNT                              6736          15
 507  PARSE_FAB_DEST_MAC_DELETE_RECEIVE_CNT                      7           0
 514  RESOLVE_INGRESS_SMAC_MISS_CNT                            106           0

?[KRP/0/RSP1/CPU0:asr_9010_clr#show controllers np counters np3 location 0/0/CPU0 | inc MAC

Fri Apr 11 01:02:37.842 dst
?[K  94  RESOLVE_EGR_VPLS_MAC_MOVE_CNT                             27           0
  95  RESOLVE_ING_VPLS_MAC_MOVE_CNT                           4013           8
  97  RESOLVE_AGE_MAC_STATIC_DROP_CNT                         3825           5
 339  RESOLVE_MAC_NOTIFY_CTRL_DROP_CNT                        6780          12
 340  RESOLVE_MAC_DELETE_CTRL_DROP_CNT                           7           0
 504  PARSE_FAB_MACN_RECEIVE_CNT                              6780          12
 507  PARSE_FAB_DEST_MAC_DELETE_RECEIVE_CNT                      7           0
 514  RESOLVE_INGRESS_SMAC_MISS_CNT                            108           1

2) Traffic will be lost going out bundle port which is receiving the broadcast/multicast traffic when bringing up standby member link of the peer  bundle port that is member of the same bridge domain.

Conditions:
(1) configuring the bundle maximum-active links feature on a bundle-ether port. on ASR9K side.
(2) the remote end is a pure layer 2 switch port configured as a trunk port with no bundle or LACP enabled.
(3) ASR9K side has two bundle-ether ports part of the same bridge domain and forwarding traffic for same VLANs. Both bundle-ether ports terminating on a "dumb"layer 2 switchport configured as trunk with no LACP enabled or any bundling capability.
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