Configuring Cisco 7206VXR as BRAS

Frank Bulk frnkblk at iname.com
Fri Apr 8 00:31:16 CEST 2011


My previous PPPoE testing used the 5th Ethernet port on the DSL modems.  Two
of the three vendors I've been working with gave me firmware updates within
the last week and I moved testing from PPPoE over Ethernet against a test
7206VXR to our production DSLAM with our production 7206VXR.

I got all three working pretty well (the status page in their GUI is lacking
in the products) and they appeared to handle /56 delegated prefix OK.

In reviewing my configuration, I ended removing three commands on my
Virtual-Template:
 ipv6 address autoconfig
 peer default ipv6 pool ipv6pool-lns
 ipv6 nd other-config-flag

The first doesn't seem necessary and all it did was add another IPv6 address
to the WAN interface of the DSL modem.  The second isn't necessary because I
use DHCPv6 relay, and the third I changed to "ipv6 nd managed-config-flag".


This is my current configuration:

interface Virtual-Template1
 mtu 1492
 ip unnumbered Loopback11
 ip access-group 125 in
 ip verify unicast source reachable-via rx 126
 ip mtu 1492
 ip tcp adjust-mss 1452
 no logging event link-status
 peer default ip address dhcp
 ipv6 unnumbered Loopback11
 ipv6 enable
 no ipv6 nd suppress-ra
 ipv6 nd managed-config-flag
 ipv6 dhcp relay destination DEAD:BEEF:0:1000::7
 ppp mtu adaptive
 ppp authentication pap radius-group-aaa
 ppp ipcp dns <IPv4 addresses>
 ppp ipcp address unique
end

interface Loopback11
 <snip IPv4 addresses>
 ip route-cache same-interface
 ipv6 address DEAD:BEEF:4000::1/64
 ipv6 enable
end


Any recommendations for improvement or advice?

Frank



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