Layer 2 Protocol Peering
For Layer 2 protocols (CDP, UDLD, LLDP, MSTP, LACP,PTP peer delay, ELMI, LOAM ) to peer with a
neighbor on a port that has an EFP service instance configured, you need to enter the
l2 protocol peer protocol
service-instance configuration command on the service instance.
This example shows how to configure CDP to peer with a neighbor on a service instance:
Router (config)# interface gigabitethernet0/1
Router (config-if)# service instance 1 Ethernet
Router (config-if-srv)# encapsulation untagged
Router (config-if-srv)# l2protocol peer cdp
Router (config-if-srv)# bridge-domain 10
Router (config-if-srv)# end
Layer 2 Protocol Forwarding
Layer 2 protocol forwarding is based on the bridge domain ID and the destination MAC address.
Selecting the l2protocol forward option causes the router to flood interfaces in the same VLAN or bridge-domain
with untagged or tagged BPDU packets. You can apply the l2protocol forward command to CDP, LACP,
LLDP, PAGP, STP, UDLD, and VTP traffic. This is an example how to configure the l2protocol forward
option:
interface GigabitEthernet0/9
ethernet uni id PRAV-PE2
service instance 1 ethernet
encapsulation untagged
l2protocol forward cdp
bridge-domain 500
!
service instance 10 ethernet xcon
encapsulation dot1q 100
l2protocol forward cdp
xconnect 4.3.2.1 12 encapsulation mpls
!
Configuring IEEE 802.1Q Tunneling and Layer 2 Protocol Tunneling Using EFPs
Tunneling is a feature used by service providers whose networks carry traffic of multiple customers and who
are required to maintain the VLAN and Layer 2 protocol configurations of each customer without impacting
the traffic of other customers. The router uses EFPs to support QinQ and Layer 2 protocol tunneling.
802.1Q Tunneling (QinQ)
Service provider customers often have specific requirements for VLAN IDs and the number of VLANs to be
supported. The VLAN ranges required by different customers in the same service-provider network might
overlap, and traffic of customers through the infrastructure might be mixed. Assigning a unique range of
VLAN IDs to each customer would restrict customer configurations and could easily exceed the VLAN limit
(4096) of the 802.1Q specification.
Using the EVCs, service providers can encapsulate packets that enter the service-provider network with
multiple customer VLAN IDs (C-VLANs) and a single 0x8100 Ethertype VLAN tag with a service provider
VLAN (S-VLAN). Within the service provider network, packets are switched based on the S-VLAN. When
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
30
Ethernet Virtual Connections Configuration
Layer 2 Protocol Peering
Содержание ASR 920 series
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