[c-nsp] TCP MSS on IOS XR

[Jordi Magrané Roig]

Dear Colleagues,

The IOS XR version is 5.1.3. The MTU is set to 2000 bytes on IOS XR device and 1500 on IOS device.

I would like to know how I must interpret the "show tcp detail pcb" and specifically the following line (IOS XR device):

Datagrams (in bytes): MSS 1460, peer MSS 1460, min MSS 1946, max MSS 1946

Is the IOS XR device using MSS 1460 or MSS 1946.

Thanks.


> Subject: Re: [c-nsp] TCP MSS on IOS XR
> To: jordimagrane at hotmail.com; cisco-nsp at puck.nether.net
> From: mark.tinka at seacom.mu
> Date: Wed, 29 Apr 2015 09:05:21 +0200
> 
> 
> 
> On 28/Apr/15 18:46, Jordi Magrané Roig wrote:
> > Dear colleagues,
> >
> > I have an ASR9000 and I have a BGP session with an IOS device. The output of the command "show tcp detail pcb" shows the following information:
> >
> > output omitted
> >
> >
> > Datagrams (in bytes): MSS 1460, peer MSS 1460, min MSS 1946, max MSS
> > 1946
> >
> > output omitted
> >
> > The IOS device is using MSS 1460 bytes but I don't know exactly the MSS that the IOS XR device is using, 1460 or 1946.
> >
> > Do you know how the command must be interpreted?
> 
> tcp mss
> 
> Mark.