Chapter 16: Dynamic Routing Protocols
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 538
Filtering RIP Routes
To filter RIP routes on an ingress interface, use the following command:
configure router
rip [no] distribute
-list <access_
list_number> in {cable |
gigabitethernet
| tengigabitethernet} SLOT/PORT
The C4/c CMTS applies filtering to the destination IP prefixes of RIPv2 updates based on the ingress interface. The ACL
defined is a standard ACL (range 0-99).
The C4/c CMTS CLI supports filtering inbound rip updates with the following syntax:
configure router
rip [no] distribute
-list <access_
list_number> in
The C4/c CMTS processes inbound RIP updates with the following rules:
1. Extract the next network from the inbound update.
2. Check the interface on which it entered.
3. Is there a distribute list applied to that interface?
Yes: Is the network denied by that list?
If the network is denied by that list or does not make it to the routing table; return to step 1.
If the network is allowed; then continue to step 4.
No, there is no list. Then go to step 4.
4. Is there a global distribute list?
Yes: Is the network denied by that list?
Yes: the network does not make it to the routing table; return to step 1.
No: the network makes it to the routing table; return to step 1.
No: The network makes it to the routing table; return to step 1.
Filtering Redistributed OSPF Routes
To filter redistributed OSPF routes, use the following commands:
configure router ospf [vrf <VRF>] [no] distribute-list ACL-NUM out static
configure router ospf [vrf <VRF>] [no] distribute-list ACL-NUM out connected
configure router ospf [vrf <VRF>] [no] distribute-list ACL-NUM out rip
configure router ospf [vrf <VRF>] [no] distribute-list ACL-NUM out bgp
configure router ospf [vrf <VRF>] [no] distribute-list ACL-NUM out isis
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