Launching soon: The world's first vendor agnostic bug scrubLearn more & join waitlist
OPERATIONAL DEFECT DATABASE
...
...
We have L2 multicast running fine in VLAN 12 (BDI 12): Router#show ip mroute vrf VRF xxx.0.0.1 IP Multicast Routing Table Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet, X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement, U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel, z - MDT-data group sender, Y - Joined MDT-data group, y - Sending to MDT-data group, G - Received BGP C-Mroute, g - Sent BGP C-Mroute, N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed, Q - Received BGP S-A Route, q - Sent BGP S-A Route, V - RD & Vector, v - Vector, p - PIM Joins on route, x - VxLAN group Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode (*, xxx.0.0.1), 5w1d/stopped, RP 10.0.0.1, flags: SJCF Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: BDI12, Forward/Sparse, 00:57:26/00:02:37 (10.38.248.101, xxx.0.0.1), 5w1d/00:01:48, flags: PFTA Incoming interface: BDI12, RPF nbr 0.0.0.0 Outgoing interface list: Null L2 multicast only. +++ Then we are doing shutdown of interface G0/3/1: Router(config)#interface GigabitEthernet0/3/1 Router(config-if)#shut *Feb 19 09:04:17.715: %VRRP-6-STATE: BDI100 IPv4 group 100 state MASTER -> BACKUP *Feb 19 09:04:17.736: %VRRP-6-STATE: BDI12 IPv4 group 12 state MASTER -> BACKUP *Feb 19 09:04:17.772: %VRRP-6-STATE: BDI1199 IPv4 group 22 state MASTER -> BACKUP Device is switching from MASTER to BACKUP, everything still works fine. +++ We are restoring the interface, device is switching back to master: Router(config)#interface GigabitEthernet0/3/1 Router(config-if)#no shut *Feb 19 09:09:28.764: %VRRP-6-STATE: BDI1199 IPv4 group 22 state BACKUP -> MASTER *Feb 19 09:09:28.880: %VRRP-6-STATE: BDI12 IPv4 group 12 state BACKUP -> MASTER *Feb 19 09:09:29.031: %VRRP-6-STATE: BDI100 IPv4 group 100 state BACKUP -> MASTER Router#show lacp multi-chassis port-channel 1 Interface Port-channel1 Local Configuration: Address: aaaa.aaaa.aaa1 Channel Group: 1 State: Active LAG State: Up Priority: 32844 Inactive Links: 0 Total Active Links: 1 Bundled: 1 Selected: 1 Standby: 0 Unselected: 0 Peer Configuration: Interface: Port-channel1 Address: aaa.aaaa.aaa2 Channel Group: 1 State: Standby LAG State: Up Priority: 32845 Inactive Links: 0 Total Active Links: 1 We are starting to observe next error, multicast stops working and never restored until manual shut/no shut of the interface Po1 interface (mLACP interface): Feb 19 09:11:09.936: IGMPSN: ERROR Join recieved after interface down: group: Received IGMPv2 report for group xxx.0.0.1 received on Vlan 12, port Po1-efp12 Feb 19 09:12:02.936: IGMPSN: ERROR Join recieved after interface down: group: Received IGMPv2 report for group xxx.0.0.1 received on Vlan 12, port Po1-efp12 Feb 19 09:13:07.937: IGMPSN: ERROR Join recieved after interface down: group: Received IGMPv2 report for group xxx.0.0.1 received on Vlan 12, port Po1-efp12 Feb 19 09:14:09.937: IGMPSN: ERROR Join recieved after interface down: group: Received IGMPv2 report for group xx.0.0.1 received on Vlan 12, port Po1-efp12
IGMP Join is received on mLACP Port-Channel, mLACP is configured
Shut/No Shut of mLACP Port-Channel
The order of events received from MLCAP Working case : STANDBY -> DOWN -> ACTIVE Non Working case : DOWN-> STANDBY->DOWN->STANDBY-> ACTIVE