New and Changed Routing Features

This table summarizes the new and changed feature information for the Routing Configuration Guide for Cisco NCS 5000 Series Routers, and tells you where they are documented.

New and Changed Routing Features

Table 1. Routing Features Added or Modified in IOS XR Release 6.3.x
Feature Description Changed in Release Where Documented

Bidirectional Forwarding

Bidirectional forwarding detection (BFD) provides low-overhead, short-duration detection of failures in the path between adjacent forwarding engines. BFD allows a single mechanism to be used for failure detection over any media and at any protocol layer, with a wide range of detection times and overhead. The fast detection of failures provides immediate reaction to failure in the event of a failed link or neighbor.

Release 6.3.1 Implementing BFD chapter

BFD over Bundle

BFD over Bundle feature enables BFD sessions to monitor the status of individual bundle member links. BFD informs the bundle manager immediately when one of the member link goes down, and reduces the bandwidth used by the bundle.

Release 6.3.1 Implementing BFD chapter

Sub-interfaces with BVI interface in Bridge Domain

Support for Layer 2 (L2) sub-interfaces to work with BVI interface in a bridge domain has been added in the Cisco IOS XR Software Release 6.3.1. The L2 sub-interfaces must have a rewrite configuration to pop the outer tag in Ingress direction and push the outer tag on the packet in egress direction. The outer tag that is to be pushed in egress direction is based on the interface encapsulation. The support is added only for single tag sub-interfaces. Double tagged sub-interfaces that work with BVI interface in a bridge domain are not supported.

Release 6.3.1 Implementing Integrated Routing and Bridging chapter