Restrictions For Implementing Bfd - Cisco NCS 6000 Series Configuration Manual

Restrictions for Implementing BFD

• If enabling BFD on Multiprotocol Label Switching (MPLS), an installed composite PIE file including
• Interior Gateway Protocol (IGP) is activated on the router if you are using IS-IS or OSPF.
• To enable BFD for a neighbor, the neighbor router must support BFD.
• You can use the echo ipv4 source command to specify the IP address that you want to use as the source
• To support BFD on bundle member links, be sure that the following requirements are met:
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,
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the MPLS package, or a composite-package image is required. For Border Gateway Protocol (BGP),
Intermediate System-to-Intermediate System (IS-IS), Static, and Open Shortest Path First (OSPF), an
installed Cisco IOS XR IP Unicast Routing Core Bundle image is required.
address.
• 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)
• 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 over PWHE
• BFD over GRE
monitored, and maintained for the IPv4 addressing type only. IPv6 and VLAN links in a bundle have
the following restrictions:
Implementing BFD