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Cisco Bug: CSCvt14323 - ASR903 IGMP: reports received on mLACP Port-Channel dropped incorrectly

Last Modified

Sep 10, 2020

Products (1)

  • Cisco ASR 900 Series Aggregation Services Routers

Known Affected Releases

16.9.4

Description (partial)

Symptom:
We have L2 multicast running fine in VLAN 12 (BDI 12):
 
LFV-ESMM-MIL-TDS-RO-01#show ip mroute vrf TDS-MIL-MGMT 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:
 
LFV-ESMM-MIL-TDS-RO-(config)#interface GigabitEthernet0/3/1
LFV-ESMM-MIL-TDS-RO-(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:
 
LFV-ESMM-MIL-TDS-RO-(config)#interface GigabitEthernet0/3/1
LFV-ESMM-MIL-TDS-RO-(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
 
LFV-ESMM-MIL-TDS-RO-01#show lacp multi-chassis port-channel 1
Interface Port-channel1
        Local Configuration:
                Address: 00a2.894c.63c0
                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: 00a2.894c.6540
                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

Conditions:
IGMP Join is received on mLACP Port-Channel, mLACP is configured
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