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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 8 Configuring Ethernet Virtual Connections
Configuring EFPs
Note Use the no forms of the commands to remove the service instance, encapsulation type, or bridge domain
or to disable the rewrite operation.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface, and enter interface configuration mode.
Valid interfaces are physical ports.
Step 3
service instance number ethernet [name] Configure an EFP (service instance) and enter service instance
configuration) mode.
• The number is the EFP identifier, an integer from 1 to 4000.
• (Optional) ethernet name is the name of a previously
configured EVC. You do not need to use an EVC name in a
service instance.
Step 4
encapsulation {dot1q | dot1ad | untagged |
default}
Configure encapsulation type for the service instance.
• dot1q—Configure 802.1Q encapsulation. See Table 8-1 for
details about options for this keyword.
• dot1ad—Configure 802.1ad encapsulation.
• untagged—Map to untagged VLANs. Only one EFP per port
can have untagged encapsulation.
• default—Configures default encapsulation.
Step 5
bridge-domain bridge-id [split-horizon group
group-id]
Configure the bridge domain ID. The range is from 1 to 4094.
• (Optional) split-horizon group group-id—Configure a
split-horizon group. The group ID is from 0 to 31. EFPs in the
same bridge domain and split-horizon group cannot forward
traffic between each other, but can forward traffic between
other EFPs in the same bridge domain but not in the same
split-horizon group.
Note You must configure encapsulation before the
bridge-domain keyword is available.
Step 6
rewrite ingress tag pop 1 symmetric (Optional) Specify that encapsulation modification to occur on
packets at ingress.
• pop 1—Pop (remove) the outermost tag.
• symmetric—Configure the packet to undergo the reverse of
the ingress action at egress. If a tag is popped at ingress, it is
pushed (added) at egress.
Note Although the symmetric keyword appears to be optional,
you must enter it for rewrite to function correctly.
Step 7
end Return to privileged EXEC mode.
Step 8
show ethernet service instance
show bridge-domain [n | split-horizon]
Verify your entries.
Step 9
copy running-config startup-config (Optional) Save your entries in the configuration file.