05-21-2020 02:55 AM
i was trying to create gre tunnel..but couldn't do it..i'm gonna attach a screenshot of a tunnel output..could anyone resolve my issue
05-21-2020 03:04 AM
Hello @arjun_4790 ,
the tunnel source address is Unknown .
Being the device a switch you have probably configured as source interface an OSI layer 2 interface.
You need to use a routed interface or an SVI as source interface.
GRE encapsulation requires to build an external IP header with a valid IP source and a valid IP destination.
Being a switch and depending on platform the GRE tunnel feature may be unsupported. This is another possible explanation for your issue.
Note : you can copy and then past a show version in a text file this is the best way to post configuration and show commands that can be hosted in a txt file.
Hope to help
Giuseppe
05-21-2020 03:39 AM
05-21-2020 06:09 AM
Hello @arjun_4790 ,
according to your feedback you have issues to use a p2p GRE tunnel to carry IPv6 traffic over IPv4.
This can be a platform limitation as a multilayer switch uses the TCAM to describe possible actions on traffic this form of tunneling may be not supported in hardware = it is not possible to program TCAM for IPv6 traffic so that it is tunneled over IPv4.
You may need to use a SW based router like an ISR to be able to implement a working GRE tunnel to carry IPv6 traffic in the payload.
Tunneling is not a typical feature of multilayer switches, they are very powerful but they have less features when compared to SW based routers.
Hope to help
Giuseppe
05-21-2020 03:41 AM
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