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GRE tunnels

Hi : I am looking info on the number of GRE tunnels support on cisco routers?

would appreciate any pointers

1 ACCEPTED SOLUTION

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Cisco Employee

Re: GRE tunnels

Hi,

The maximum number of GRE tunnels in a router it totally dependent on the IDB limit.

You can see the IDB limit for your router by typing 'show idb'...

W228.04.12-2801#sh idb

Maximum number of Software IDBs 1200. In use 16.

As you can see, this Cisco 2801 has a total of 1200 IDBs and 16 are currently in use. You can do 'show idb' on your router and verify how many free idbs you have. Of course, you would probably want an encryption module in the router so that the encryption is done in hardware (otherwise, cpu would likely be the limitation...not the number of tunnels).

HTH,

Bobby

*Please rate helpful posts.

1 REPLY
Cisco Employee

Re: GRE tunnels

Hi,

The maximum number of GRE tunnels in a router it totally dependent on the IDB limit.

You can see the IDB limit for your router by typing 'show idb'...

W228.04.12-2801#sh idb

Maximum number of Software IDBs 1200. In use 16.

As you can see, this Cisco 2801 has a total of 1200 IDBs and 16 are currently in use. You can do 'show idb' on your router and verify how many free idbs you have. Of course, you would probably want an encryption module in the router so that the encryption is done in hardware (otherwise, cpu would likely be the limitation...not the number of tunnels).

HTH,

Bobby

*Please rate helpful posts.

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