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Beginner

Can't Ping Loopback Interface of GSR 12008

dear Forum,

I have enabled IPv6 in our 12008 GSR with running IOS version: 12.0.32-S2. Also we have activated OSPFv3 as IGP.

At this point, I can't ping the self loopback interface of this GSR. There are other interfaces also configured for IPv6 and I do can ping all of them including the peering addresses and OSPF relationship is UP as well.

I also do get the OSPF Routes and can reach all of them from the GSR. But the loopback interface of the GSR is neither reachable from the Local terminal nor from any other routers.

My problem is with iBGP due to this reachability issue.

Relevant configuration is as follows. v6 CEF is activated.

#

#

#

ipv6 unicast-routing

no ipv6 source-route

!

interface Loopback0

ip address A.B.C.D 255.255.255.255

no ip directed-broadcast

ipv6 address XXXX:YYYY::2/128

ipv6 enable

ipv6 ospf 100 area 0

end

!

ipv6 router ospf 100

log-adjacency-changes

passive-interface default

no passive-interface FastEthernet4/7

no passive-interface GigabitEthernet6/0

#

#

#

Console output is as follows:

#

#

#

Hostname-R1#sh ipv6 int lo0

Loopback0 is up, line protocol is up

  IPv6 is enabled, link-local address is FE80::200:FF:FE0C:A900

  Global unicast address(es):

    XXXX:YYYY::2, subnet is XXXX:YYYY::2/128

  Joined group address(es):

    FF02::1

    FF02::2

    FF02::5

    FF02::1:FF00:2

    FF02::1:FF0C:A900

  MTU is 1514 bytes

  ICMP error messages limited to one every 100 milliseconds

  ICMP redirects are enabled

  ND DAD is not supported

  ND reachable time is 30000 milliseconds

  Hosts use stateless autoconfig for addresses.

Hostname-R1#

Hostname-R1#ping XXXX:YYYY::2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2400:CA00::2, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

Hostname-R1#

Hostname-R1#ping XXXX:YYYY::4

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2400:CA00::4, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/8/16 ms

Hostname-R1#

#

#

#

Thanks in advance. Please let me know if any further information is required.

Tahmeed

4 REPLIES 4
Beginner

Can't Ping Loopback Interface of GSR 12008

can you run the following  commands ....

show ipv6 route local

show vrf

sh run int loop 0

Beginner

Can't Ping Loopback Interface of GSR 12008

i think its a limitation on the IOS version. i checked with a /64 loopback address and it works fine. but with the /128 its not.

pls correct me if i am wrong. my IOS version is 12.0.32S2

Highlighted
Cisco Employee

Can't Ping Loopback Interface of GSR 12008

Hi,

It's a bug (CSCsd82180) which is fixed into 12.0(32)S3 and later.

HTH

Laurent.

Beginner

Can't Ping Loopback Interface of GSR 12008

Thanks!

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