From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Sun Oct 14 2007 - 05:37:12 ART
Hi Group,
I'm stuck with a problem I don't really understand.
R2 and R4 are connected via a frame relay PVC. I configured their interfaces
as p2p sub-int. Configs as follows:
R2
-- ipv6 unicast-routing ! interface Loopback0 no ip address ipv6 address 2199:1999:3999:4F39::2/64 ! interface Serial0/0/0 no ip address encapsulation frame-relay no frame-relay inverse-arp ! interface Serial0/0/0.4 point-to-point description ** To R4 ** ipv6 address FEC0:0:0:24::2/64 ipv6 address FE80::2 link-local ipv6 ospf 1 area 0 frame-relay interface-dlci 104 ! ipv6 router ospf 1 router-id 2.2.2.2 log-adjacency-changes !R4 -- ipv6 unicast-routing ! interface Loopback0 no ip address ipv6 address 2888:1111:4444:1111::4/64 ! interface Serial0/0 no ip address encapsulation frame-relay no frame-relay inverse-arp ! interface Serial0/0.2 point-to-point description ** To R2 ** ipv6 address FEC0:0:0:24::4/64 ipv6 address FE80::4 link-local ipv6 ospf 1 area 0 frame-relay interface-dlci 401 ! ipv6 router ospf 1 router-id 4.4.4.4 log-adjacency-changes redistribute connected metric-type 1 route-map CON2OSPFv3 ! route-map CON2OSPFv3 permit 10 match interface Loopback0 !
Verification: ------------- R2#sh ipv os n
Neighbor ID Pri State Dead Time Interface ID Interface 4.4.4.4 1 FULL/ - 00:00:31 14 Serial0/0/0.4
R2#sh ipv ro os OE1 2888:1111:4444:1111::/64 [110/801] via FE80::4, Serial0/0/0.4
The issue is, R2 ping to R4's loopback IPv6 address (2888:1111:4444:1111::4) failed, as follows:
R2#pi 2888:1111:4444:1111::4
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2888:1111:4444:1111::4, timeout is 2 seconds: ..... Success rate is 0 percent (0/5)
Doing "deb ipv6 icmp" on R4, I noticed the following logs:
ICMPv6: Received ICMPv6 packet from 2199:1999:3999:4F39::2, type 128 ICMPv6: Received echo request from 2199:1999:3999:4F39::2 ICMPv6: Sending echo reply to 2199:1999:3999:4F39::2
Why R2 sourced from its loopback IPv6 address (2199:1999:3999:4F39::2) when it pinged to R4?
The issue is resolved when I advertised R2's loopback into OSPF, as follows:
R2(config)#int lo0 R2(config-if)#ipv os 1 are 0 R2(config-if)#do pi 2888:1111:4444:1111::4
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2888:1111:4444:1111::4, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 28/28/32 ms
Kindly help me understand the concept better.
Thank you.
B.Rgds, Lim TS
This archive was generated by hypermail 2.1.4 : Fri Nov 16 2007 - 13:11:14 ART