Administrative Distance ValueRouting Protocols
20External BGP
90Internal EIGRP
110OSPF
115IS-IS
120RIP version 1 and 2
170External EIGRP
200Internal BGP
255Unknown
An administrative distance is an integer from 0 to 255. In general, the higher the value, the lower the trust
rating. An administrative distance of 255 means the routing information source cannot be trusted at all and
should be ignored. Administrative distance values are subjective; there is no quantitative method for choosing
them.
Routing Policy Options for RIP
Route policies comprise series of statements and expressions that are bracketed with the route-policy and
end-policy keywords. Rather than a collection of individual commands (one for each line), the statements
within a route policy have context relative to each other. Thus, instead of each line being an individual
command, each policy or set is an independent configuration object that can be used, entered, and manipulated
as a unit.
Each line of a policy configuration is a logical subunit. At least one new line must follow the then , else ,
and end-policy keywords. A new line must also follow the closing parenthesis of a parameter list and the
name string in a reference to an AS path set, community set, extended community set, or prefix set. At least
one new line must precede the definition of a route policy, AS path set, community set, extended community
set, or prefix set. One or more new lines can follow an action statement. One or more new lines can follow a
comma separator in a named AS path set, community set, extended community set, or prefix set. A new line
must appear at the end of a logical unit of policy expression and may not appear anywhere else.
Authentication Using Keychain in RIP
Authentication using keychain in Cisco IOS XR Routing Information Protocol (RIP) provides mechanism to
authenticate all RIP protocol traffic on RIP interface, based keychain authentication. This mechanism uses
the Cisco IOS XR security keychain infrastructure to store and retrieve secret keys and use it to authenticate
in-bound and out-going traffic on per-interface basis.
Keychain management is a common method of authentication to configure shared secrets on all entities that
exchange secrets such as keys, before establishing trust with each other. Routing protocols and network
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
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Implementing RIP
Routing Policy Options for RIP
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