Chapter 23: IPv6
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 740
Figure 92: Scenario for Prefix Stability
The setup in the figure above shows two C4/c CMTSs connected to one northbound router (NBR). In this scenario the cable
modem is initially connected to the first one but then is moved to the second one as a result of node split.
The DHCPv6 server is configured to delegate the IPv6 prefixes to SYS-1 (System-1) and SYS-2 (System-2). There are three
different prefix ranges configured in this example. First, any residential subscriber on SYS-1 is always delegated one of the
/64 IPv6 prefixes from the pool FC0D:C422:FFFF::/48. Second, any residential subscriber on SYS-2 is always delegated one
of the /64 prefixes from the pool FC0D:C420:FFFF::/48.
A third prefix, 2009:0DB8:85A2:0631::/64, is a floating prefix and is delegated to a commercial customer, no matter which
of the two C4/c CMTSs this commercial customer may be connected to.
Note: For more information on how the C4/c CMTS uses IS-IS, Multiple Topology IS-IS, and OSPF (including OSPFv3), see
the appropriate sections of the see "Dynamic Routing Protocols (page 457) chapter.
DHCPv6 Server
The procedure below provides an example of Prefix Stability configured to use IS-IS. It assumes a Level 1 type node.
Configure the DHCPv6 server to allocate a static IPv6 PD route to the gateway/CPE behind this modem. Static IPv6 PD
means if a modem/CPE is moved from SYS-1 to SYS-2 or vice versa, the DHCPv6 Server will lease the same IPv6 PD to this
gateway/CPE.
Configuring Prefix Stability Using IS-IS
There are two parts of this procedure. Part 1 is the configuration of the first C4/c CMTS.
To Configure IS-IS on SYS-1
1. Configure IS-IS at the node level:
configure router isis is-type level-1
configure router isis net 47.0001.0002.0003.0004.00
configure router isis metric-style wide level-1-2
configure router isis address-family ipv6 multi-topology
configure router isis address-family ipv6 enable
configure router isis address-family ipv4 enable no
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