Cisco ASR 9000 Series Routing Configuration Manual page 659

Implementing Routing Policy
RFCs
RFCs
RFC 1771
RFC 4360
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Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
Title
A Border Gateway Protocol 4 (BGP-4)
BGP Extended Communities Attribute
Link
http://www.cisco.com/techsupport
Additional References
629