Cisco Catalyst 4500 Series Software Configuration Guide

27-15
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 27 Configuring EtherChannel and Link State Tracking
Configuring EtherChannel
This example shows how to configure LACP port channel min-links:
Switch# configure terminal
Switch(config)# interface port-channel 25
switch(config-if)# port-channel min-links 3
Switch# show etherchannel 25 summary
switch# end
For a switch in VSS mode, when the minimum links requirement on a port channel is not met, the local
ports in the EtherChannel are assigned m state, and all traffic is redirected out through the virtual switch
link, via the member ports of the port channel on the peer switch, for example:
Switch# show etherchannel 25 summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use N - not in use, no aggregration
f - failed to allocate aggregator
M - not in use, no aggregation due to minimum links not met
m- not in use, port not aggregated due to minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 125
Number of aggregators: 125
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
25 Po25(RU) LACP Gi1/3/1(D) Gi1/3/2(m) Gi2/2/25(P) Gi2/2/26(P)
When the minimum links requirement is not met in standalone switches, the port channel is flagged and
assigned the SM/SN or RM/RN state, for example:
Switch# show etherchannel 25 summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use N- not in use, no aggregration
f - failed to allocate aggregator
M - not in use, no aggregation due to minimum links not met
m- not in use, port not aggregated due to minimum links not met
u - unsuitable for bundling
Step 2
Switch(config-if)# port-channel min-links
min-links-number
Specifies the minimum number of member ports that
must be in the link-up state and bundled in the
EtherChannel for the port channel interface to transition
to the link-up state.
The valid range for min-links-number is 2 to 8.
For a switch in VSS mode, when setting up min-links,
ensure that the port-channel consists of the same number
of min-links on the active switch and on the standby
switch. For example, if you set min-links to 2 for a port-
channel, ensure that there are 2 links, each, available on
the active and the standby switch.
Step 3
Switch# end
Returns to privileged EXEC mode
Command Purpose

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E