[nsp] ipv6 address ::X/128 on Cisco router

Yinglam Cheung ccie6961 at yahoo.com
Thu Jun 17 15:11:17 EDT 2004

it seems that I cannot use any /128 ipv6 address on Cat6509. it's understood
that :: and ::1 are reserved, but I'm not sure the others in /128. The
cat6509 is running s720 with 12.2(17d)SXB.
s720(config-if)#int lo0
s720(config-if)#ipv addr ::7/128
% Invalid address

however, I can assign ::5/128 to a juniper router and actually I advertise
this route to Cat6509:
s720#sh ipv ro ospf
IPv6 Routing Table - 10 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
O   ::5/128 [110/1]
     via FE80::290:69FF:FE98:3001, FastEthernet2/3
s720# ping ipv ::5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to ::5, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms


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