Chapter 23: IPv6
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Cleaning up Stale Routes for IPv6 Prefix Stability
Route snooping provides an automatic mechanism to clean up previously established PDRI routes that subsequently have
been moved to a different C4/c CMTS. When a routing protocol indicates that a route from such a prefix is listed in the
routing tables of two C4/c CMTSs, then the C4/c CMTSs establish which one has a connected cable modem using that
route. The C4/c CMTS that determines that the CM associated with that route is offline deletes that route from its routing
table.
IPv6 Distribute Lists
IPv6 Distribute Lists allow certain routes, including PDRI routes, to be advertised (redistributed) via a null route. ACLs are
used to specify IP-based filters. The distribute lists specify the type of redistributed route (connected, static, or PD) on
which the filter is to be applied. Distribute lists can be applied to the following types of IPv6 route redistribution:
Connected into
OSPFv3 and IS-IS
Static into
OSPFv3 and IS-IS
Prefix Delegation (PD) into
OSPFv3 and IS-IS
Use the procedure below to create an example of a distribute list that redistributes PD routes into OSPFv3. In this example
the system operator wants to redistribute PD routes via OSPFv3, but there is one particular route
(2001:db8:c420:c001::2/64) that he does not want to be redistributed.
Note: For more information see
Route Redistribution for IPv4 Addresses
Sample Distribute List for OSPFv3 PD Routes
The distribute list created in the procedure below is for IPv6 addresses.
To Create a Distribute List for OSPFv3 PD Routes
1.
Redistribute PD routes via OSPFv3:
configure ipv6 router ospf redistribute pd
2.
Define an access list with the particular IP address to be denied:
configure ipv6 access-list ingress_acl deny 2001:db8:c420:c001::2/64