Configuration Guide

Table Of Contents
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October 2021
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22.3.2.3 Unknown unicast or multicast/broadcast traffic
The multicast addresses are built out of two pieces. Each SPB node must be configured with a unique Nick-
name that is carried in the IS-IS link state database and is used to form the first portion of the multicast
MAC address (with the multicast bit set: multicast address is Nickname & “3”). The second portion is the
ISID id converted to hex forming the Multicast MAC address.
For example, in reference to 8005:
Nickname = 0.80.05
ISID = 1002256 (0x0f:4b:10)
Multicast address = 03:08:05:0f:4b:10 for ISID 1002256
Step 1 – Display Multicast address used for unknown unicast or multicast/broadcast traffic
show isis spbm multicast-fib
EDM
Configuration -> IS-IS -> SPBM -> Multicast FIB
Results: The following is shown from 8005
8005:3#
show isis spbm multicast-fib ISID 1002256
================================================================================
SPBM MULTICAST FIB ENTRY INFO
================================================================================
MCAST DA ISID BVLAN SYSID HOST-NAME OUTGOING-INTERFACES
03:08:05:0f:4b:10 1002256 4051 0024.43b4.e3df 8005 2/5,IST,2/21
0
3:08:06:0f:4b:10 1002256 4052 001e.1f48.f3df 8006
0
3:08:07:0f:4b:10 1002256 4052 00e0.7bb3.07df 8007
On each switch, verify the following information:
Option Verify
MCAST DA
Verify that the correct multicast address for each switch
ISID 10011155
4001: 03:04:01:0f:46:c3
9001: 03:09:01:0f:46:c3
9002: 03:09:02:0f:46:c3
7001: 03:07:01:0f:46:c3
7002: 03:07:02:0f:46:c3
ISID 1002256
8005: 03:08:05:0f:4b:10
8006: 03:08:06:0f:4b:10
8007: 03:08:07:0f:4b:10