Our 7609 running 12.2(33)SRE2 has been using DHCPv6-PD relay with static router insertion (with an external DHCPv6 server) for over a year now and it's worked quite well for customers on our access platform. The 7609 snoops the DHCPv6 responses and builds the static route like it's supposed to.
Sep 27 14:02:46.714 CDT: IPv6 DHCP: Received SOLICIT from FE80::5ED9:98FF:FE64:6823 on Vlan10 Sep 27 14:02:46.714 CDT: IPv6 DHCP_RELAY: Relaying SOLICIT from FE80::5ED9:98FF:FE64:6823 on Vlan10 Sep 27 14:02:46.714 CDT: IPv6 DHCP_RELAY: Packet forwarded to <stripped> Sep 27 14:02:46.714 CDT: IPv6 DHCP: Sending RELAY-FORWARD to <stripped> on Vlan3 Sep 27 14:02:46.714 CDT: IPv6 DHCP: Received RELAY-REPLY from <stripped> on Vlan3 Sep 27 14:02:46.714 CDT: IPv6 DHCP_RELAY: Relaying RELAY-REPLY from <stripped> on Vlan3 Sep 27 14:02:46.714 CDT: IPv6 DHCP_RELAY: Packet forwarded to FE80::5ED9:98FF:FE64:6823 via Vlan10 Sep 27 14:02:46.714 CDT: IPv6 DHCP: Sending ADVERTISE to FE80::5ED9:98FF:FE64:6823 on Vlan10 Sep 27 14:02:47.726 CDT: IPv6 DHCP: Received REQUEST from FE80::5ED9:98FF:FE64:6823 on Vlan10 Sep 27 14:02:47.726 CDT: IPv6 DHCP_RELAY: Relaying REQUEST from FE80::5ED9:98FF:FE64:6823 on Vlan10 Sep 27 14:02:47.726 CDT: IPv6 DHCP_RELAY: Packet forwarded to <stripped> Sep 27 14:02:47.726 CDT: IPv6 DHCP: Sending RELAY-FORWARD to <stripped> on Vlan3 Sep 27 14:02:47.726 CDT: IPv6 DHCP: Received RELAY-REPLY from <stripped> on Vlan3 Sep 27 14:02:47.726 CDT: IPv6 DHCP_RELAY: Relaying RELAY-REPLY from <stripped> on Vlan3 Sep 27 14:02:47.726 CDT: [DHCPv6 Relay]IPv6RT[default]: static, Route add <stripped>:1000:F800::/56 [new 1/0] Sep 27 14:02:47.726 CDT: [DHCPv6 Relay]IPv6RT[default]: static, Added path FE80::5ED9:98FF:FE64:6823/Vlan10 Sep 27 14:02:47.726 CDT: IPv6 DHCP_RELAY: Route added: <stripped>:1000:F800::/56 via FE80::5ED9:98FF:FE64:6823 dist 1 ia id 08646823 lifetime 43200 Sep 27 14:02:47.726 CDT: IPv6 DHCP_RELAY: Packet forwarded to FE80::5ED9:98FF:FE64:6823 via Vlan10 Sep 27 14:02:47.726 CDT: IPv6 DHCP: Sending REPLY to FE80::5ED9:98FF:FE64:6823 on Vlan10 Our access platform vendor has a new major release that we're testing on a lab shelf that now adds LDRA support. We noticed that we could receive a IPv6 address and delegated prefix on our CE, but had no routability. Using the same Cisco debug commands that gave me the output above, I could see that no static routes were being added. I did some packet sniffing between the access platform and the 7609 and I could see that the access platform's LDRA added an Interface-ID (option 18), Remote Identifier (option 37), and of course the original DHCP request (option 9). Now the access platform's LDRA must not mangle it so badly because our 7609 does relay it to the external DHCPv6 server and relays back its response, but the 7609 is not inserting a static route. Hence no routability between CE and the 7609. Has anyone run into this before, and if so, what needs to be done? I tried chasing down the "dhcp snoop trusted" route, but it seems to be IPv4 only. Perhaps I ran into a limitation of this rendition code and it's addressed in a future release, but my google-fu has not uncovered anything. There's some talk about DHCPv6 relay chaining support in 15.x, but it doesn't explicitly say it's needed to get static route insertion working again. Any assistance would be helpful. Regards, Frank _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
