Aug 30 2008
Upgrading IOS on an ME 3400
Recently I was trying to upgrade the IOS on an ME3400. I spent about an hour trying to work out why I couldn’t ping a port on the switch which I had configured as a routed port with a /30 address.
After consulting CCO I found the following document.
http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_25_seg_seg1/configuration/guide/swtrbl.html#wp1122353
The switch has a built in control plane policer which by default drops most control plane traffic received on UNI interfaces( ie customer facing interfaces). The document above gives three ways to overcome the control plane policer if you want to allow ping access to the switch. I used the service policy option and low and behold I could ping the switch and upgrade the image using TFTP.
After further reading I realised there is a fouth option which I havent tested yet, you could if you just want to upgrade the image convert the port to an NNI port using the following command. This should then allow you to ping, TFTP etc.
————————————————————————-
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface fastethernet0/1
Switch(config-if)# port-type nni
Switch(config-if)# no shutdown
———————————————————————————-