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Community Member

Cat 4500 GRE Tunnel performances

Hello, I have som performances issues with a GRE Tunnel on 4500 (12.2(37)SG with Supervisor V).

I think that GRE Tunnel is performed on SW, isn't ?

Does someone know the max throughput that we can get on that tunnel ?

I'm afraid that fragmentation can also decrease the performances, ho can I check the number of fragmented packet on that tunnel ?

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8 REPLIES

Re: Cat 4500 GRE Tunnel performances

hi,

Its true that GRE packets are process switched in 4500 series switches running with any codes  i.e Switched in software. I think it will give you performance between 5 to 15 Mbps at max. It may also lead to high CPU utilization during the specified data rates.

HTH

Hitesh Vinzoda

Hall of Fame Super Silver

Re: Cat 4500 GRE Tunnel performances

Hello Helenio,

use of GRE tunnels on a Cisco 4500 is not recommended it would lead to very high cpu usage with rather poor performances.

We also noticed that is not possible to move traffic in a VRF using a GRE tunnel in VRF.

What is your scenario?

Hope to help

Giuseppe

Community Member

Re: Cat 4500 GRE Tunnel performances

I'm using GRE tunnel cause I have to set up a EIGRP comunication over VPN-IPsec (2x Fortigate FWs). I did a test and I had 70% CPU with 40 Mbps traffic.

Do you see another way to establish a EIGRP Neighborship trhough a VPN IPsec Tunnel ?

For the VRF you mean that you can't assign a Tunnel to a VRF other that the Global one ?

Hall of Fame Super Gold

Re: Cat 4500 GRE Tunnel performances

As Giuseppe mentioned above, you must use router not switches for tunnels.

Community Member

Re: Cat 4500 GRE Tunnel performances

Where can I fing Tunnel performances based on RTR Model ?

Hall of Fame Super Silver

Re: Cat 4500 GRE Tunnel performances

Hello Helenio,

use the following PDF, a newer version exists including new G2 ISR routers.

Hope to help

Giuseppe

Community Member

Re: Cat 4500 GRE Tunnel performances

Thank's ... Tunnel GRE in Routers is done in Fast/CEF ? ...

Hall of Fame Super Silver

Re: Cat 4500 GRE Tunnel performances

Hello Helenio,

yes sw based routers have no dramatic performance penalties when handling GRE tunnels.

CEF for tunnel GRE should be supported in recent IOS releases

Hope to help

Giuseppe

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