Chapter 23: IPv6
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
746
ACT Active-IS, IS Inactive-IS, OOS Inactive-OOS
Dist/
IPv6 Route Dest / mask Act Next Hop
Metric Protocol RouteAge Interface
================= === ============================= ====== ======= ======== ===========
::/0
ACT 2001:cada:c420:1702::1 1/0
netmgmt 02:18:46 gigE 17/2.0
2009:0db8:85a2:0631/64 ACT fe80::216:46ff:fe88:2aaf 2/0 pd
00:01:15 cMac 1.0
fc0d:c420:ffff::/48
ACT ::
1/0 netmgmt 01:39:55 null 0
fc0d:c420:ffff:25::/64 ACT fe80::217:13ff:fe05:122 2/0 pd
01:46:46 cMac 1.0
fc0d:c420:ffff:26::/64 ACT fe80::217:13ff:fe05:108 2/0 pd
01:46:46 cMac 1.0
fc0d:c420:ffff:27::/64 ACT fe80::217:13ff:fe05:10d 2/0 pd
01:46:46 cMac 1.0
fc0d:c420:ffff:28::/64 ACT fe80::217:13ff:fe05:101 2/0 pd
01:46:46 cMac 1.0
fc0d:c422:ffff::/48
ACT fe80::217:13ff:fe05:105 118/20 isis(eL1) 00:02:10 gigE 17/2.0
2001:cada:c420:1702/64 ACT 2001:cada:c420:1702::2 0/0 local 02:18:46 gigE 17/2.0
For OSPF IGP, the route protocol type will be ospf(E1) instead of isis(eL1) for all OSPF learned routes.
Debug Logging
Logging should be turned on for debugging only and should be turned off in live systems. The following command can be
issued (before moving the modem) to see the logging messages when the route collision is detected.
configure logging debug dhcpv6 pd prefix-stab
When the route collision is detected and debug logging is turned on, messages similar to the following appear in the logs:
On SYS-1:
show logging history
19:44:19 6 debg: Debug:dhcpv6.pd.prefix-stab:Prefix Stability Enabled: Received notification of
IGP(ISIS) route conflict for PD Prefix - Prefix 2009:0DB8:85A2:0631::/64 NHIP ::
19:44:19 6 debg: Debug:dhcpv6.pd.prefix-stab:Checking that modem 00:15:cf:9a:4b:e1 is online for
PD Prefix 2009:0DB8:85A2:0631::/64 NHIP fe80::200:ff:fe00:5
19:44:19 6 warn: IPv6 Prefix-Stability: CM 00:15:cf:9a:4b:e1 is offline - deleting PD Prefix
2009:0DB8:85A2:0631::/64 NHIP fe80::200:ff:fe00:5
On SYS-2:
show logging history
17:57:26 7 debg: Debug:dhcpv6.pd.prefix-stab:Prefix Stability Enabled: Received notification of
PD Prefix conflict for IGP(ISIS) route - Prefix 2009:0DB8:85A2:0631::/64 NHIP
fe80::217:13ff:fe05:105
17:57:26 7 debg: Debug:dhcpv6.pd.prefix-stab:Checking that modem 00:15:cf:9a:4b:e1 is online for
PD Prefix 2009:0DB8:85A2:0631::/64 NHIP fe80::216:46ff:fe88:2aaf
17:57:26 7 debg: Debug:dhcpv6.pd.prefix-stab:CM 00:15:cf:9a:4b:e1 is online - keeping PD Prefix
2009:0DB8:85A2:0631::/64 NHIP fe80::216:46ff:fe88:2aaf