Bfd Over Pseudowire Headend; Bfd Over Satellite Interfaces; Bfd Over Irb - Cisco ASR 9000 Series Configuration Manual

Implementing BFD
The BFD switching mechanism for IPv6 Multihop link is employed when the BFD packets are transmitted
from one end point node to the other. The BFD punting mechanism is employed when BFD packets are
received at the remote end point node.

BFD over Pseudowire Headend

The Bidirectional Forwarding Detection over Pseudowire Headend (BFDoPWHE) feature enables BFD
support over the customer edge (CE) to pseudowire headend (S-PE) links for fast failure detection along the
path between the eBGP neighbors.
BFD over PWHE is supported only on ASR 9000 Enhanced Ethernet Line Card.
BFD over PWHE supports:
• BFD sessions per pseudo-wire for end-to-end fault detection between the CE and PWHE PE
• BFDv4 for IPv4 and BFDv6 for IPv6 (static and BGP)
• BFD asynchronous mode over PWHE
• Pseudowire VC type 4 and type 5
For PWHE to be operational, the BFD agent should be hosted on one of the line cards that is part of the PWHE
generic interface list. The BFD multipath must be configured for a line card that is part of the generic interfaces
list.
Use the bfd multipath include location node-id command to include specific line cards to host BFD multiple
path sessions and thereby enable BFD over PWHE.

BFD over Satellite Interfaces

Bidirectional Forwarding Detection (BFD) over satellite interfaces feature enables BFD support on satellite
line cards. Satellite interfaces are known as virtual (bundle) interfaces. BFD uses multipath infrastructure to
support BFD on satellite line cards. BFD over satellite is a multipath (MP) single-hop session and is supported
on IPv4 address, IPv6 global address, and IPv6 link-local address. The BFD over Satellite is supported only
on ASR 9000 Enhanced Ethernet Line Card and is supported in asynchronous mode. BFD over satellite is
not supported in echo mode.
Note • The bfd multipath include location node-id command is not supported on ASR 9000 Ethernet Line
• BFD over Satellite Interfaces is not supported on nV Edge system.

BFD over IRB

In order for a VLAN to span a router, the router must be capable of forwarding frames from one interface to
another, while maintaining the VLAN header. If the router is configured for routing a Layer 3 (network layer)
protocol, it will terminate the VLAN and MAC layers at the interface on which a frame arrives. The MAC
OL-30423-03
Card. Hence, BFD over Satellite Interfaces feature does not work on the ASR 9000 Ethernet Line
Card.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
BFD over Pseudowire Headend
193