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Switching Configuration 45
Example #5: Show IGMP Snooping Querier Information for VLAN 10
console#show ip igmp snooping querier vlan 10
Vlan 10 : IGMP Snooping querier status
----------------------------------------------
IGMP Snooping Querier Vlan Mode................ Enable
Querier Election Participate Mode.............. Enable
Querier Vlan Address........................... 10.10.11.40
Operational State.............................. Querier
Operational version............................ 2
Operational Max Resp Time...................... 10
Link Aggregation/Port Channels
This section shows how to use the Link Aggregation feature to configure port-channels via the
Command Line Interface and the Graphical User Interface.
The Link Aggregation (LAG) feature allows the switch to treat multiple physical links between two end-
points as a single logical link called a port-channel. All of the physical links in a given port-channel must
operate in full-duplex mode at the same speed.
You can use the feature to directly connect two switches when the traffic between them requires high
bandwidth and reliability, or to provide a higher bandwidth connection to a public network.
You can configure the port-channels as either dynamic or static. Dynamic configuration uses the IEEE
802.3ad standard, which provides for the periodic exchanges of LACPDUs. Static configuration is used
when connecting the switch to an external switch that does not support the exchange of LACPDUs.
The feature offers the following benefits:
• Increased reliability and availability: If one of the physical links in the port-channel goes down, traffic is
dynamically and transparently reassigned to one of the other physical links.
• Increased bandwidth: The aggregated physical links deliver higher bandwidth than each individual
link.
• Incremental increase in bandwidth: A physical upgrade could produce a 10-times increase in
bandwidth; LAG produces a two- or five-times increase, useful if only a small increase is needed.
Management functions treat a port-channel as if it were a single physical port.
You can include a port-channel in a VLAN. You can configure more than one port-channel for a given
switch.