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Setting MTU on the CSS11500

Our new WAN provider recommends setting an MTU on our hosts to avoid fragmentation and issues as there are multiple layers of IPSEC encapsulation going on across the WAN.

I can't find a command to set the MTU on the CSS11500 the way I can on all my other Cisco gear. Hoping someone here can help before I go to the TAC.

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Cisco Employee

Re: Setting MTU on the CSS11500

you can't change the MTU but you can play with the TCP MSS which is all you should need.

CSS11503-2(config)# flow tcp-mss ?

Integer value(Range: 1-1460)

CSS11503-2(config)# flow tcp-mss

Gilles.

1 REPLY
Cisco Employee

Re: Setting MTU on the CSS11500

you can't change the MTU but you can play with the TCP MSS which is all you should need.

CSS11503-2(config)# flow tcp-mss ?

Integer value(Range: 1-1460)

CSS11503-2(config)# flow tcp-mss

Gilles.

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