# Configuring an RP Router for PIM Sparse Mode

When you use the router for PIM sparse mode, some VRs must act as RP routers. If you want to control PIM more tightly, you can configure a static RP router. To do so:

1. Configure an access list that details the multicast groups that can use the static RP router (in this case, all globally scoped multicast groups).
   host1(config)#ipv6 access-list boston permit ff0e::/16 any
2. Specify a static RP router.
   host1(config)#ipv6 pim rp-address ::122:1 boston

ipv6 pim rp-address

- Use to specify a static PIM RP router.
- Specify a standard IPv6 access list of multicast groups to control which multicast groups can use this RP router.
- Specify the override keyword if you want this static RP router to have priority over auto-RP routers.
- Example
  host1(config)#ipv6 pim rp-address 2001::1 76 override
- Use the no version to clear the filter from this interface.
- See ipv6 pim rp-address.