Verifying Multicast Mcache for Multicast Groups which Share Same Multicast MAC Address (MLD snooping)
If there are two multicast groups
(ff1e::10:1:1 and ff1e::11:1:1) which map to the same multicast MAC address, the
show ipv6 multicast mcache command
output for one of the groups will be empty. - Get the mapped multicast MAC address
for the interested multicast group (use 32 as bit value for exact match).
device# show ipv6 multicast group ff1e::11:1:1 match-last-bits 32 Display groups sharing same mac address 3333.0001.0001 with group ff1e::11:1:1 for all vlans on all ports. p-:physical, ST:static, QR:querier, EX:exclude, IN:include, Y:yes, N:no VL4089 : 15 grp, 25 grp-port group p-port ST QR life mode source 1 ff1e::10:1:1 lg1 N Y 180 EX 0 2 ff1e::10:1:1 e1/1/8 N Y 180 EX 0 3 ff1e::11:1:1 lg1 N Y 180 EX 0 4 ff1e::11:1:1 e1/1/8 N Y 180 EX 1 - Using the multicast MAC address
(3333.0001.0001), get the multicast group address with which the mcache is programmed.
device# show ipv6 multicast mac-mcache 3333.0001.0001 Example: MAC = xxxx.xxxx.xxxx Vlan = #, l2mc = # , ref_cnt = # IP Multicast Group : Mcast Group, Src Addr OIF: 1/1/22 TR(1/1/32,1/1/33), TR is trunk, 1/1/32 primary, 1/1/33 output Total Multicast Mac Cache: 11 vlan 4089, 11 caches 1 MAC=3333.0001.0001, vlan=4089, l2mc=259, ref_cnt=1 IP Multicast Group (* ff1e::10:1:1) OIF: 1/1/8 lg1 - Verify whether the multicast mcache is
present for the multicast group ff1e::10:1:1.
device# show ipv6 multicast mcache ff1e::10:1:1 Example: (S G) (MAC ADDR) cnt=: SRC and GRP IPv4/IPv6 address, Multicast Mac address, cnt is number of SW processed packets OIF: 1/1/22 TR(1/1/32,1/1/33), TR is trunk, 1/1/32 primary, 1/1/33 output IPv6 Multicast Forwarding Mode: MAC Total Multicast Cache: 11 vlan 4089, 11 caches. 1 (* ff1e::10:1:1) (3333.0001.0001) cnt=19 OIF: tag e1/1/8 tag lg1 age=4s up-time=63s, change=63s l2mc=259 (ref-cnt=1)