Cisco ASR 9000 Series Configuration Guidelines

• The I-BEB contains the I-Component of the MAC-in-MAC bridge. It performs B-MAC encapsulation
and inserts the I-SIDs based on the provider VLAN tags (S-tags), customer VLAN tags (C-tags), or
S-tag/C-tag pairs.
• The IB-BEB contains one or more I-Components and a single B-Component interconnected through a
LAN segment.
Only IB-BEBs are supported on Cisco ASR 9000 Series Routers. Cisco IOS XR supports IB-BEB bridge type
at the Edge node.
Note
IB-BEB
The IB-BEB contains both the I-Component and the B-Component. The bridge selects the B-MAC and inserts
the I-SID based on the provider VLAN tag (S-tag), the customer VLAN tag (C-tag), or both the S-tag and the
C-tag. It validates the I-SIDs and it transmits and receives frames on the B-VLAN.
The IEEE 802.1ah on Provider Backbone Bridges feature supports all services mandated by the IEEE 802.1ah
standard and extends the services to provides these additional functionalities:
• S-Tagged Service:
• In multiplexed environments each S-tag maps to an I-SID and may be retained or removed.
• In bundled environments multiple S-tags map to the same I-SID and the S-tags must be retained.
• C-Tagged Service:
• In multiplexed environments each C-tag maps to an I-SID and may be retained or removed.
• In bundled environments multiple C-tags map to the same I-SID and the C-tags must be retained.
• S/C-Tagged Service:
• In multiplexed environments each S-tag/C-tag pair maps to an I-SID. The S-tag or the S-tag/C-tag
pair may be retained or removed.
• In bundled environments multiple S-tag/C-tags pairs map to the same I-SID and the S-tag/C-tag
pair must be retained.
• Port-based Service
• A port-based service interface is delivered on a Customer Network Port (CNP). A port-based service
interface may attach to a C-VLAN Bridge, 802.1d bridge, router or end-station. The service provided
by this interface forwards all frames without an S-Tag over the backbone on a single backbone
service instance. A port-based interface discards all frames with an S-Tag that have non-null VLAN
IDs.
This example shows how to configure a port-based service:
interface GigabitEthernet0/0/0/10.100 l2transport
encapsulation untagged
--> Creates an EFP for untagged frames.
interface GigabitEthernet0/0/0/10.101 l2transport
encapsulation dot1ad priority-tagged
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
359
Implementing IEEE 802.1ah Provider Backbone Bridge
IB-BEB

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model