If you connect the second port (26) you run the risk of spanning tree issue. The easiest way to do it is to have a short outage window, shut int 25 connect int 26 and shut it down. Then add both ports (25 and 26) to the Portchannel and and then issue "no sh" on the Portchannel interface That will bring up all the physical interfaces too.
check with "sh etherchannel summary" to make sure the portchannel has the proper ports and it is up
In your first case since you don't already have a portchannel, when you add a port to it, there will sill be short outage to transition to portchannel. Again, you can try this but there is no guarantee how the port and the portchannel can behave at the time and not cause a bigger outage.
In your second case, since you already have a portchannel with copper ports, you can first down the fiber ports, connect them, add them to to the portchannel and than bring the ports up. Usually best practice for portchannel is to sh the portchannel, add the interfaces and then bring up your portchannel
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.