This table lists default administrative distances for the common protocols.
Table 3: Default Administrative Distances
Administrative Distance DefaultProtocol
0Connected or local routes
1Static routes
20External BGP routes
110OSPF routes
115IS-IS routes
200Internal BGP routes
The administrative distance for some routing protocols (for instance IS-IS, OSPF, and BGP) can be changed.
See the protocol-specific documentation for the proper method to change the administrative distance of that
protocol.
Changing the administrative distance of a protocol on some but not all routers can lead to routing loops and
other undesirable behavior. Doing so is not recommended.
Note
RIB Statistics
RIB supports statistics for messages (requests) flowing between the RIB and its clients. Protocol clients send
messages to the RIB (for example, route add, route delete, and next-hop register, and so on). RIB also sends
messages (for example, redistribute routes, advertisements, next-hop notifications, and so on). These statistics
are used to gather information about what messages have been sent and the number of messages that have
been sent. These statistics provide counters for the various messages that flow between the RIB server and
its clients. The statistics are displayed using the show rib statistics command.
RIB maintains counters for all requests sent from a client including:
• Route operations
• Table registrations
• Next-hop registrations
• Redistribution registrations
• Attribute registrations
• Synchronization completion
RIB also maintains counters for all requests sent by the RIB. The configuration will disable the RIB next-hop
dampening feature. As a result, RIB notifies client immediately when a next hop that client registered for is
resolved or unresolved. RIB also maintains the results of the requests.
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
123
Implementing and Monitoring RIB
RIB Statistics
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