Restrictions For Implementing Bfd - Cisco ASR 9000 Series Routing Configuration Manual

Restrictions for Implementing BFD

Restrictions for Implementing BFD
These restrictions apply to BFD:
• Demand mode is not supported in Cisco IOS XR software.
• BFD echo mode is not supported for these features:
• BFD for IPv6 has these restrictions:
•
• For BFD on bundle member links, only a single BFD session for each bundle member link is created,
• Echo latency detection and echo validation are not supported on bundle interfaces.
• BFD Multihop can be run on any non-default VRF but selective VRF download must be disabled. For
• BFD over GRE feature is not supported on Cisco ASR 9000 Series SPA Interface Processor-700.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
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◦ The routers on either end of the bundle are connected back-to-back without a Layer 2 switch in
between.
◦ For a BFD session to start, any one of the following configurations or states are present on the
bundle member:
Link Aggregation Control Protocol (LACP) Distributing state is reached, –Or–
EtherChannel or POS Channel is configured, –Or–
Hot Standby and LACP Collecting state is reached.
◦ BFD for IPv4 on bundled VLANs
◦ BFD for IPv6 (global and link-local addressing)
◦ BFD with uRPF (IPv4 or IPv6)
◦ Rack reload and online insertion and removal (OIR) when a BFD bundle interface has member
links that span multiple racks
◦ BFD for Multihop Paths
◦ BFD for IPv6 is not supported on bundled VLAN interfaces
◦ BFD for IPv6 static routes, OSPFv3, and BGP are supported by the client
◦ BFD for IPv6 static routes that have link-local address as the next-hop is not supported
monitored, and maintained for the IPv4 addressing type only. IPv6 and VLAN links in a bundle have
the following restrictions:
◦ IPv6 states are not explicitly monitored on a bundle member and they inherit the state of the IPv4
BFD session for that member interface.
◦ VLAN subinterfaces on a bundle member also inherit the BFD state from the IPv4 BFD session
for that member interface. VLAN subinterfaces are not explicitly monitored on a bundle member.
more information on the configuration and commands for selective VRF download, see Cisco ASR 9000
Series Aggregation Services Router Routing Configuration Guide and Cisco ASR 9000 Series Aggregation
Services Router Routing Command Reference
Implementing BFD