Cisco Cisco Packet Data Gateway (PDG)

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  Routing 
BGP-4 Routing  ▀   
 
VPC-VSM System Administration Guide, StarOS Release 19  ▄  
 
   
219 
rt_number
 specifies a Route Target as a string in AS:NN format, where AS = 2-byte AS-community hexadecimal 
number and NN = 2-byte hexadecimal number (1 to 11 characters). You can add multiple route numbers to an IP 
extcommunity list. 
Filtering via a BGP Extended Community
 
To filter routes based on a BGP extended community (route target), you configure a match clause in a route map. The 
command sequence follows below. 
config 
   context context_name 
      route-map map_name { deny | permit } 
          [no] match extcommunity { named  named_list | standard  identifier } 
BGP Local Preference 
The BGP local preference attribute is sent by BGP speaker only to IBGP peers. It is set in a route map via the following 
command sequence: 
config 
   context context_name 
      route-map map_name { deny | permit } 
         set local-preference pref_number 
There is no match clause corresponding to local preference in the route-map because local-preference is directly used in 
the route selection algorithm. 
ICSR and SRP Groups 
BGP is employed with Interchassis Session Recovery (ICSR) configurations linked via Service Redundancy Protocol 
(SRP). By default an ICSR failover is triggered when all BGP peers within a context are down.  
Optionally, you can configure SRP peer groups within a context. ICSR failover would then occur if all peers within a 
group fail. This option is useful in deployments in which a combination of IPv4 and IPv6 peers are spread across 
multiple paired VLANs, and IPv4 or IPv6 connectivity is lost by all members of a peer group. 
For additional information refer to Interchassis Session Recovery in this guide and the description of the monitor bgp
monitor diameter and monitor authentication-probe commands in the Service Redundancy Protocol Configuration 
Mode Commands
 chapter of the Command Line Interface Reference
Advertising BGP Routes from a Standby ICSR Chassis  
An SRP Configuration mode command enables advertising BGP routes from an ICSR chassis in standby state. This 
command and its keywords allow an operator to take advantage of faster network convergence accrued from deploying 
BGP Prefix Independent Convergence (PIC) in the Optical Transport Network Generation Next (OTNGN).