Cisco Cisco Packet Data Gateway (PDG)
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.
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.
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:
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.
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.
(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.
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.
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).
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).