•Support for the following SPAs was introduced:
–Cisco 4-Port Clear Channel T3/E3 SPA
–Cisco 1-Port Channelized OC-3/STM-1 SPA
–Cisco 4-Port OC-3c/STM-1 POS SPA
–Cisco 8-Port OC-3c/STM-1 POS SPA
•Support for the following BFD features was added:
–Support for BFD Per Member Links on Link Bundles was introduced.
–The echo latency detect command was added to enable latency detection for BFD echo packets on non-bundle interfaces.
–The echo startup validate command was added to verify the echo path before starting a BFD session on non-bundle interfaces.
Note Documentation was added for the following BFD features introduced in earlier Cisco IOS XR releases:
•Support for the following applications with BFD was added:
–Hot Standby Router Protocol (HSRP)
–Virtual Router Redundancy Protocol (VRRP)
•The dampening command was added to minimize BFD session flapping and delay session startup.
•The echo ipv4 source command was added to specify a source IP address and override the default.
•The ipv6 checksum command was added to enable and disable IPv6 checksum computation in BFD and BFD interface configuration modes.
For more information, see the "Configuring Bidirectional Forwarding Detection on the Cisco ASR 9000 Series Router" chapter.