09-19-2008 04:31 AM - edited 03-03-2019 11:37 PM
Does anyone know why spanning-tree would place the Fa0 interface on a c871 in to a self-looped state?
When we connect a PC to the interface everything works fine and the PC can ping the vlan1 interface on the router. As soon as we place a switch on the same port 'sh spanning-tree' shows:
Port 1 (FastEthernet0) of VLAN1 is self-looped
The router is on a customers site and they are connecting a Linksys SRW248G4, it is only connecting to the one port on the 871 router and the switch connects to nothing else.
Spanning-tree indicates that the router is root for vlan1.
Any ideas? The router is running c870-advipservicesk9-mz.124-4.T1
Regards
Mel
09-19-2008 04:34 AM
Hello Mel,
a cross-over RJ-45 cable could help in connecting to another switch port.
or you need to enable negotiation of MDXI
Hope to help
Giuseppe
09-19-2008 05:46 AM
Thanks for the response.
The interface shows Up & Up so I am presuming that the link is OK. it's set to 100 full.
How do you enable negotiation of MDX on these routers I can't see anything under the interface settings for change this.
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