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Configuring FlexLinks and the MAC Address-Table Move Update
Maintaining and Monitoring the FlexLinks and MAC Address-Table Move Update
Maintaining and Monitoring the FlexLinks and MAC
Address-Table Move Update
Configuration Examples for the FlexLinks and MAC
Address-Table Move Update
Configuring FlexLinks Port: Examples
These are configuration examples for learning the other FlexLinks port as the mrouter port when FlexLinks is configured,
with output for the show interfaces switchport backup command:
This output shows a querier for VLANs 1 and 401, with their queries reaching the switch through the specified port:
Switch# show ip igmp snooping querier
Vlan IP Address IGMP Version Port
-------------------------------------------------------------
1 1.1.1.1 v2 Gi0/1
401 41.41.41.1 v2 Gi0/1
Here is output for the show ip igmp snooping mrouter command for VLANs 1 and 401:
Switch# show ip igmp snooping mrouter
Vlan ports
---- -----
1 Gi1/17(dynamic), Gi1/18(dynamic)
401 Gi1/17(dynamic), Gi1/18(dynamic)
Similarly, both FlexLinks ports are part of learned groups. In this example, GigabitEthernet1/17 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 Gi1/17, Gi1/18, Fa2/1
1 228.1.5.2 igmp v2 Gi1/17, Gi1/18, 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 GigabitEthernet1/17, because the backup
port GigabitEthernet1/18 is blocked. When the active link, GigabitEthernet1/17, goes down, the backup port,
GigabitEthernet1/18, begins forwarding.
As soon as this port starts forwarding, the switch sends proxy reports 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 multicast data. This is the default behavior of
FlexLinks. This behavior changes when the user configures fast convergence using the switchport backup interface
GigabitEthernet1/18 multicast fast-convergence command. This example shows how this feature is configured:
Command Purpose
show interfaces [interface-id] switchport backup Displays the FlexLinks backup interface configured
for an interface or all the configured FlexLinks and
the state of each active and backup interface (up or
standby mode). When VLAN load balancing is
enabled, the output displays the preferred VLANs
on active and backup interfaces.
show mac address-table move update Verifies the configuration.
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