Cisco ME 3800X Command Reference Manual page 152

l2protocol
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)
Examples 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 Command
service instance
Cisco ME 3800X and ME 3600X Switch Command Reference
2-128
Chapter 2
Description
Creates a service instance on an interface.
Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
OL-28238-01