GigabitEthernet1/1 is up, line protocol is down (notconnect)
I am really curious to investigate a possible reason behind this error message.
During the configuration of a port channel bundled with 2 links I have the error in the subject but only for one side of the connection and only for one link part of the port channel.
On the other side the corrispondent interface was up/up and the other link part of the port channel was able to go up with no issue (for all the configuration is the same).
- The link in discussion was connecting the two Multilayer swicthes before the configuration of the port channel with no issue
- The port channel is a L2 etherchannel
- What was done was simply to shutdown the interface on both swicthes, add the command channel group xx mode on on both side of the connection and then bring up the connection with the result above showed: one side up/down (not connect) and the other side up/up
I am excluding problem with the configuration. The reason is simple: i just reply the configuration to the all links (total 2) part of the port channel with no issue.
Can be a cabling problem (SFP)? Again keep in mind that before the change, this link was active with no issue for 4 years.
Re: GigabitEthernet1/1 is up, line protocol is down (notconnect)
Guys I read something that may be can be related to this issue.
In the interface Gi1/1 was active a SPAN session. Traffic from this interface was monitored.
I read in a different blog that
The interfaces in a port channel must share the same speed and duplex, trunking encapsulation(if not trunking – the same access vlan), the same STP cost per per VLAN, and no ports can have SPAN configured.
What do you think?
Moreover I will share here what was the MST cost of the port-channel at boht end of the link
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