Cisco ME 3800X Command Reference Manual page 152

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In ME3800X platform, Cisco IOS Release 12.2(52)EY, the forward keyword is not supported for the

l2protocol command. Therefore, it is impossible to forward Layer 2 control packets from a ME3800X

switch to a Cisco 7600 router and vice versa. The tunnel option in ME3800X overwrites the

PDU-destination MAC address with a well-known Cisco proprietary multicast address

(01-00-0c-cd-cd-d0), while the forward option in Cisco 7600 simply forwards the PDU without any

change or local processing; thus, the two platforms cannot cooperate.

For example:

Peer: PDUs are processed locally

Tunnel: Overwrites the PDU-destination MAC address with a well-known Cisco proprietary multicast

address (01-00-0c-cd-cd-d0)

This example shows how to configure the service instance to peer CDP with a neighbor service instance:

Switch(config)# interface gigabitethernet0/1

Switch(config-if)# switchport mode trunk

Switch(config-if)# switchport trunk allowed vlan none

Switch(config-if)# service instance 1 Ethernet

Switch(config-if-srv)# encapsulation untagged

Switch(config-if-srv)# l2protocol peer cdp

Switch(config-if-srv)# bridge-domain 1

Switch(config-if-srv)# exit

Related Commands

service instance

Cisco ME 3800X and ME 3600X Switch Command Reference

Creates a service instance on an interface.

Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands