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New Member

Unable to ping between IPV6 addresses within the same LAN

Hi,

I have a "ISR 2911" with "EHWIC-4ESG" used as ethernet switch module.. The four ports in this card are assigned to the same VLAN connecting to routers as these are in the same LAN subnet  for IPV4 and IPV6 addressing.

I am able to ping from IPV4 address between the routers. But when i try to ping IPV6 addresses among these routers, i am able to ping only between 2 routers and unable to ping between the other two.

I have connected the four routers in an actual switch (Cisco 3560) and it works fine as i am able to ping (IPV6) between all these 4 routers within the same LAN. But when i use Cisco 2911 with ethernet switching card then it is not working (Unable to ping (IPV6)  between 2 routers).

There is no problem with IPV4  but only with IPV6 ICMP. .I have observed only the issue with IPV6 ICMP, as i can run HSR Pfor IPV6 via ethernet switch module in 2911. That means this switch card is fucntioning except for IPV6 ICMP.

Can some one please help me why the issue is only for IPV6 ICMP packets when using ethernet switch card ?

PS : Attached HLD diagram

Thanks in advance,

Anil.

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Unable to ping between IPV6 addresses within the same LAN

Hi Anil,

You are most likely hitting CSCtt61762.

CSCtt61762

IPV6 multicast frames are not forwarded between ports on  EHWIC-*ESG

Bear in mind that the ipv6 neighbor discovery process makes use of multicast.

Regards

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtt61762

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
4 REPLIES
Cisco Employee

Unable to ping between IPV6 addresses within the same LAN

Hi Anil,

You are most likely hitting CSCtt61762.

CSCtt61762

IPV6 multicast frames are not forwarded between ports on  EHWIC-*ESG

Bear in mind that the ipv6 neighbor discovery process makes use of multicast.

Regards

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtt61762

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Unable to ping between IPV6 addresses within the same LAN

Hello Harold,

Many thanks for the update .

At present I am using IOS - 15.1(4)M2. I will try with more latest release and will let you know how's it going !!

Thanks again..

Regards,

Anil.

New Member

Unable to ping between IPV6 addresses within the same LAN

Hello Harold,

I have tried IOS Ver 15.1(4)M5 and can perform IPV6 via the switch ports . Works fine .

Thanks a lot for the help !!

Regards,

Anil.

New Member

Re: Unable to ping between IPV6 addresses within the same LAN

I am facing the same issue with my 2960X catalyst

version

Switch Ports Model                     SW Version            SW Image

------ ----- -----                     ----------            ----------

*    1 28    WS-C2960X-24TD-L          15.2(2)E6             C2960X-UNIVERSALK9-M

Can some one help me in this ? I could not find a software update for it .

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