As a networking adviser in 3Anetwork, I have recieved so much mails from MDS9513 users about Advisorying a problem when add a new ISL to an existing Port
Channel config.
I am here to answer the typical parts to help users :
The ISL port is up state and correctly configured like another
ports in port channel.
Looks bellow the error:
MDS1300M6A# show port-channel summary
------------------------------------------------------------------------------
Interface
Total Ports Oper
Ports First Oper Port
------------------------------------------------------------------------------
port-channel
1
4
4
fc12/48
port-channel
2
2
2
fc6/47
MDS1300M6A# show port-channel database
port-channel 1
Administrative channel
mode is active
Operational channel mode
is active
Last membership update
failed: port not compatible [Resources Unavailable]
First operational port is fc12/48
4 ports in total, 4 ports up
Ports: fc12/48 [up] *
fc10/48 [up]
fc11/48 [up]
fc9/48 [up]
You can settle it down this way:By default interfaces that are
put into a SAN port channel must have rate-mode dedicated set. I personally
think this is over kill and wastes resources.
The work around that I have used many times is to use a shared
mode port-channel. To do this you must first create the port-channel, set the
switchport mode to F, channel mode active and set the rate-mode to shared and
then add the interfaces to it using the force keyword. Here is an example
config
feature npiv
feature fport-channel-trunk
interface port-channel 11
channel mode active
switchport mode F
switchport description SAN Port Channel to UCS 6140-A
fc2/1-6,fc3/1-6
switchport rate-mode shared
interface fc1/1
switchport description UCS 6140-A fc2/1
channel-group 11 force
no shutdown
interface fc1/2
switchport description UCS 6140-A fc3/1
channel-group 11 force
interface fc1/7
switchport description UCS 6140-A fc2/2
channel-group 11 force
no shutdown
interface fc1/8
switchport description UCS 6140-A fc3/3
channel-group 11 force
no shutdown
interface fc1/13
switchport description UCS 6140-A fc2/3
channel-group 11 force
no shutdown
interface fc1/14
switchport description UCS 6140-A fc3/4
channel-group 11 force
no shutdown
When a port is in rate-mode shared there are no guarantees on
how much of the port group bandwidth the port will actually have access to.
Depending on the line card there are port groups made of up 6 ports, all 6
ports share 12-13GB of bandwidth. When a port in a port-group is placed in
dedicated mode it is gauranteed 4/8G depending on the line card and SFP.
Take a look at this config guide
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