Примечания к выпуску для Cisco Cisco IOS XR Software Release 4.3
Software Features Introduced in Cisco IOS XR Software Release 4.3.1 for Cisco
ASR 9000 Series Aggregation Service Router
ASR 9000 Series Aggregation Service Router
BFD over MPLS Traffic Engineering LSPs
Bidirectional Forwarding Detection ( BFD) over MPLS Traffic Engineering Label Switched Paths (LSPs) feature in Cisco IOS XR
Software detects MPLS Label Switched Path LSP data plane failures. Since the control plane processing required for BFD control
packets is relatively smaller than the processing required for LSP Ping messages, BFD can be deployed for faster detection of data
plane failure for a large number of LSPs.
Software detects MPLS Label Switched Path LSP data plane failures. Since the control plane processing required for BFD control
packets is relatively smaller than the processing required for LSP Ping messages, BFD can be deployed for faster detection of data
plane failure for a large number of LSPs.
The BFD over MPLS TE LSPs implementation in Cisco IOS XR Software is based on RFC 5884: Bidirectional Forwarding Detection
(BFD) for MPLS Label Switched Paths (LSPs). LSP Ping is an existing mechanism for detecting MPLS data plane failures and for
verifying the MPLS LSP data plane against the control plane. BFD can be used for for detecting MPLS data plane failures, but not
for verifying the MPLS LSP data plane against the control plane. A combination of LSP Ping and BFD provides faster data plane
failure detection on a large number of LSPs.
(BFD) for MPLS Label Switched Paths (LSPs). LSP Ping is an existing mechanism for detecting MPLS data plane failures and for
verifying the MPLS LSP data plane against the control plane. BFD can be used for for detecting MPLS data plane failures, but not
for verifying the MPLS LSP data plane against the control plane. A combination of LSP Ping and BFD provides faster data plane
failure detection on a large number of LSPs.
For more information on configuring BFD over MPLS Traffic Engineering LSPs, see the Implementing Bidirectional Forwarding
Detection chapter in the Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide. For complete command
reference of the BFD over MPLS Traffic Engineering LSPs commands, see the Bidirectional Forwarding Detection Commands
chapter in the Cisco ASR 9000 Series Aggregation Services Router Routing Command Reference.
Detection chapter in the Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide. For complete command
reference of the BFD over MPLS Traffic Engineering LSPs commands, see the Bidirectional Forwarding Detection Commands
chapter in the Cisco ASR 9000 Series Aggregation Services Router Routing Command Reference.
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.
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
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.
thereby enable BFD over PWHE.
For more information on configuring BFD over Pseudowire Headend, see the Implementing Bidirectional Forwarding Detection
chapter in the Cisco ASR 9000 Series Aggregation Services Router Routing Command Reference. For complete command reference
of the BFD commands, see the Bidirectional Forwarding Detection Commands chapter in the Cisco ASR 9000 Series Aggregation
Services Router Routing Command Reference.
chapter in the Cisco ASR 9000 Series Aggregation Services Router Routing Command Reference. For complete command reference
of the BFD commands, see the Bidirectional Forwarding Detection Commands chapter in the Cisco ASR 9000 Series Aggregation
Services Router Routing Command Reference.
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
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
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