Cisco NCS 5500 Series Configuration Manual page 113

Implementing BGP
SUMMARY STEPS
1. configure
2. vrf vrf-name
3. address-family { ipv4 | ipv6 } unicast
4. maximum prefix maximum [ threshold ]
5. import route-policy policy-name
6. import route-target [ as-number : nn | ip-address : nn ]
7. export route-policy policy-name
8. export route-target [ as-number : nn | ip-address : nn ]
9. commit
DETAILED STEPS
Step 1 configure
Step 2 vrf vrf-name
Example:
RP/0/RP0/CPU0:router(config)# vrf vrf_pe
Configures a VRF instance.
Step 3 address-family { ipv4 | ipv6 } unicast
Example:
RP/0/RP0/CPU0:router(config-vrf)# address-family ipv4 unicast
Specifies either the IPv4 or IPv6 address family and enters address family configuration submode.
To see a list of all the possible keywords and arguments for this command, use the CLI help (?).
Step 4
maximum prefix maximum [ threshold ]
Example:
RP/0/RP0/CPU0:router(config-vrf-af)# maximum prefix 2300
Configures a limit to the number of prefixes allowed in a VRF table.
A maximum number of routes is applicable to dynamic routing protocols as well as static or connected routes.
You can specify a threshold percentage of the prefix limit using the mid-threshold argument.
Step 5
import route-policy policy-name
Example:
RP/0/RP0/CPU0:router(config-vrf-af)# import route-policy policy_a
(Optional) Provides finer control over what gets imported into a VRF. This import filter discards prefixes that do not
match the specified policy-name argument.
Step 6 import route-target [ as-number : nn | ip-address : nn ]
Configuring a VPN Routing and Forwarding Instance in BGP
BGP Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
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