Displaying Etherchannel, Pagp, And Lacp Status; Understanding Link-State Tracking - Cisco 3750G - Catalyst Integrated Wireless LAN Controller Configuration Manual

Chapter 34 Configuring EtherChannels and Link-State Tracking

Displaying EtherChannel, PAgP, and LACP Status

To display EtherChannel, PAgP, and LACP status information, use the privileged EXEC commands
described in
Table 34-4 Commands for Displaying EtherChannel, PAgP , and LACP Status
Command
show etherchannel [channel-group-number {detail |
port | port-channel | protocol | summary}] {detail |
load-balance | port | port-channel | protocol |
summary}
show pagp [channel-group-number] {counters |
internal | neighbor}
show lacp [channel-group-number] {counters |
internal | neighbor}
You can clear PAgP channel-group information and traffic counters by using the clear pagp
{channel-group-number counters | counters} privileged EXEC command.
You can clear LACP channel-group information and traffic counters by using the clear lacp
{channel-group-number counters | counters} privileged EXEC command.
For detailed information about the fields in the displays, see the command reference for this release.

Understanding Link-State Tracking

Link-state tracking, also known as trunk failover, is a feature that binds the link state of multiple
interfaces. For example, link-state tracking provides redundancy in the network when used with server
NIC adapter teaming. When the server network adapters are configured in a primary or secondary
relationship known as teaming, if the link is lost on the primary interface, connectivity is transparently
switched to the secondary interface.
As shown in
links to switches and other network devices. Server 3 and server 4 use switch B for primary links and
switch A for secondary links. This configuration ensures that the traffic flow is balanced in the network.
Ports connected to servers are referred to as downstream ports, and ports connected to distribution
switches and network devices are referred to as upstream ports.
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OL-8550-02
Table 34-4:
Figure 34-6, server 1 and server 2 use switch A for primary links and switch B for secondary
Switch A provides primary links to server 1 and server 2 through link-state group 1. Port 1 is
connected to server 1, and port 2 is connected to server 2. Port 3 and port 4 on switch A also provide
secondary links through link-state group 2. Port 5 and port 6 are connected to distribution switch 1
through link-state group 1, and port 7 and port 8 are also connected to distribution switch 2 through
link-state group 2.
Switch B provides primary links to server 3 and sever 4 through link-state group 2 and secondary
links to server 1 and server 2 through link-state group 1. Port 3 and port 4 are connected to server 3
and server 4 through the primary links in link-state group 1. Port 1 and port 2 are connected to
server 1 and server 2 through secondary links in link-state group 2. Port 5 and port 6 are connected
to distribution switch 2 through link-state group 2; port 7 and port 8 are connected to distribution
switch 1 through link-state group 1.
Displaying EtherChannel, PAgP, and LACP Status
Description
Displays EtherChannel information in a brief, detailed, and
one-line summary form. Also displays the load-balance or
frame-distribution scheme, port, port-channel, and protocol
information.
Displays PAgP information such as traffic information, the
internal PAgP configuration, and neighbor information.
Displays LACP information such as traffic information, the
internal LACP configuration, and neighbor information.
Catalyst 3750 Switch Software Configuration Guide
34-23