Routing Descriptor Blocks
directly connected, via Null0
Route metric is 0
No advertising protos.
Default Address Family for show Commands
Most of the show commands provide address family (AFI) and subaddress family (SAFI) arguments (see
RFC 1700 and RFC 2858 for information on AFI and SAFI). The Cisco IOS XR software parser provides the
ability to set the afi and safi so that it is not necessary to specify them while running a show command. The
parser commands are:
• set default-afi { ipv4 | ipv6 | all }
• set default-safi
The parser automatically sets the default afi value to ipv4 and default safi value to unicast . It is necessary
to use only the parser commands to change the default afi value from ipv4 or default safi value from unicast
. Any afi or safi keyword specified in a show command overrides the values set using the parser commands.
BGP Keychains
BGP keychains enable keychain authentication between two BGP peers. The BGP endpoints must both comply
with draft-bonica-tcp-auth-05.txt and a keychain on one endpoint and a password on the other endpoint does
not work.
See the System Security Configuration Guide for Cisco NCS 6000 Series Routers for information on keychain
management.
BGP is able to use the keychain to implement hitless key rollover for authentication. Key rollover specification
is time based, and in the event of clock skew between the peers, the rollover process is impacted. The
configurable tolerance specification allows for the accept window to be extended (before and after) by that
margin. This accept window facilitates a hitless key rollover for applications (for example, routing and
management protocols).
The key rollover does not impact the BGP session, unless there is a keychain configuration mismatch at the
endpoints resulting in no common keys for the session traffic (send or accept).
BGP Nonstop Routing
The Border Gateway Protocol (BGP) Nonstop Routing (NSR) with Stateful Switchover (SSO) feature enables
all bgp peerings to maintain the BGP state and ensure continuous packet forwarding during events that could
interrupt service. Under NSR, events that might potentially interrupt service are not visible to peer routers.
Protocol sessions are not interrupted and routing states are maintained across process restarts and switchovers.
BGP NSR provides nonstop routing during the following events:
• Route processor switchover
• Process crash or process failure of BGP or TCP
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
37
Implementing BGP
Default Address Family for show Commands
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