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Cisco IE 2000 Switch Software Configuration Guide
OL-25866-01
Chapter 24 Configuring FlexLinks and the MAC Address-Table Move Update
Configuration Examples for the FlexLinks and MAC Address-Table Move Update
---- -----
1 Gi1/1(dynamic), Gi1/2(dynamic)
401 Gi1/1(dynamic), Gi1/2(dynamic)
Similarly, both FlexLinks ports are part of learned groups. In this example, GigabitEthernet1/1 is a
receiver/host in VLAN 1, which is interested in two multicast groups:
Switch# show ip igmp snooping groups
Vlan Group Type Version Port List
-----------------------------------------------------------------------
1 228.1.5.1 igmp v2 Gi1/1, Gi1/2, Fa2/1
1 228.1.5.2 igmp v2 Gi1/1, Gi1/2, Fa2/1
When a host responds to the general query, the switch forwards this report on all the mrouter ports. In
this example, when a host sends a report for the group 228.1.5.1, it is forwarded only on
GigabitEthernet1/1, because the backup port GigabitEthernet1/2 is blocked . When the active link,
GigabitEthernet1/1, goes down, the backup port, GigabitEthernet1/2, begins forwarding.
As soon as this port starts forwarding, the switch sends proxy r eports for the groups 228.1.5.1 and
228.1.5.2 on behalf of the host. The upstream router learns the groups and starts forwarding multic ast
data. This is the default behavior of FlexLinks. This behavior changes when the user configures fast
convergence using the switchport backup interface GigabitEthernet1/2 multicast fast-convergence
command. This example shows how this feature is configure d:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface GigabitEthernet1/1
Switch(config-if)# switchport backup interface GigabitEthernet1/2 multicast
fast-convergence
Switch(config-if)# exit
Switch# show interfaces switchport backup detail
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet1/1 GigabitEthernet1/2 Active Up/Backup Standby
Preemption Mode : off
Multicast Fast Convergence : On
Mac Address Move Update Vlan : auto
This output shows a querier for VLAN 1 and 401 with their queries reaching the switch through the
configured port:
Switch# show ip igmp snooping querier
Vlan IP Address IGMP Version Port
-------------------------------------------------------------
1 1.1.1.1 v2 Gi1/1
401 41.41.41.1 v2 Gi1/1
This is output for the show ip igmp snooping mrouter command for VLAN 1 and 401:
Switch# show ip igmp snooping mrouter
Vlan ports
---- -----
1 Gi1/1(dynamic), Gi1/2(dynamic)
401 Gi1/1(dynamic), Gi1/2(dynamic)
Similarly, both the FlexLinks ports are a part of the learned groups. In this example, the port is a
receiver/host in VLAN 1, which is interested in two multicast groups:
Switch# show ip igmp snooping groups
Vlan Group Type Version Port List
-----------------------------------------------------------------------