Information Technology Reference
In-Depth Information
Table23-4 Summary of All Possible Channeling Mode Scenarios
Auto
Desirable
Channel
Desirable
On
Not Channel (errdisable)
Desirable
Off
Not Channel
Desirable
Auto
Channel
Desirable
Desirable
Channel
We turned off the channel from the previous example using the following command on Switch A and
Switch B:
Switch-A (enable)
set port channel 2/1-4 auto
Port(s) 2/1-4 channel mode set to auto.
The default channel mode for a port that is capable of channeling is auto. To verify this, enter the
following command:
Switch-A (enable)
show port channel 2/1
Port Status Channel Channel Neighbor Neighbor
mode status device port
----- ---------- --------- ----------- ------------------------- ----------
2/1 connected
auto
not channel
The previous command also shows that currently the ports are not channeling. Another way to verify the
channel state is as follows:
Switch-A (enable)
show port channel
No ports channelling
Switch-B (enable)
show port channel
No ports channelling
To make the channel work with PAgP is really very simple. At this point, both switches are set to auto
mode, which means that they will channel if a connected port sends a PAgP request to channel. Setting
Switch A to desirable causes Switch A to send PAgP packets to the other switch, asking it to channel.
Switch-A (enable) s
et port channel 2/1-4 desirable
Port(s) 2/1-4 channel mode set to desirable.
1999 Dec 15 22:03:18 %PAGP-5-PORTFROMSTP:Port 2/1 left bridg1
1999 Dec 15 22:03:18 %PAGP-5-PORTFROMSTP:Port 2/2 left bridge port 2/2
1999 Dec 15 22:03:18 %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3
1999 Dec 15 22:03:18 %PAGP-5-PORTFROMSTP:Port 2/4 left bridge port 2/4
1999 Dec 15 22:03:19 %PAGP-5-PORTFROMSTP:Port 2/2 left bridge port 2/2
1999 Dec 15 22:03:19 %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3
1999 Dec 15 22:03:20 %PAGP-5-PORTFROMSTP:Port 2/4 left bridge port 2/4
1999 Dec 15 22:03:23 %PAGP-5-PORTTOSTP:Port 2/1 joined bridge port 2/1-4
1999 Dec 15 22:03:23 %PAGP-5-PORTTOSTP:Port 2/2 joined bridge port 2/1-4
1999 Dec 15 22:03:23 %PAGP-5-PORTTOSTP:Port 2/3 joined bridge port 2/1-4
1999 Dec 15 22:03:24 %PAGP-5-PORTTOSTP:Port 2/4 joined bridge port 2/1-4
