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Implementing Routing Policy on Cisco IOS XR Software
Information About Implementing Routing Policy on Cisco IOS XR Software
RC-394
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Some BGP route attributes are inaccessible from some BGP attach points for various reasons. For
example, the set med igp-cost only command makes sense when there is a configured igp-cost to
provide a source value. Table 2 summarizes which operations are valid and where they are valid.
table-policy as-path in
is-local
length
neighbor-is
originates-from
passes-through
unique-length
n/a
as-path-length is, ge, le, eq n/a
as-path-unique-length is, ge, le, eq n/a
community is-empty
matches-any
matches-every
n/a
local-preference is, ge, le, eq n/a
destination in n/a
med is, eg, ge, le n/a
next-hop in n/a
origin is n/a
rib-metric n/a set
source in n/a
tag n/a set
traffic-index n/a set
1. The max-reachable value is 4294967295.
2. The mpls-label attribute is implicit in the conditional syntax; it is implied by the route-has-label operator.
Table 1 BGP Attributes and Operators (continued)
Attach Point Attribute Match Set
Table 2 Restricted BGP Operations by Attach Point
import export aggregation redistribution
prepend as-path eBGP only eBGP only n/a n/a
prepend as-path
most-recent
eBGP only eBGP only n/a n/a
replace as-path eBGP only eBGP only n/a n/a
set med igp-cost forbidden eBGP only forbidden forbidden
set weight n/a forbidden n/a n/a
suppress forbidden forbidden n/a forbidden