[c-nsp] TCP MSS on IOS XR

[Edward Salonia]

Useful link (hopefully) -
http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-xr-software/116350-trouble-ios-xr-mtu-00.html

- Ed

On Tue, Apr 28, 2015 at 4:34 PM, Jared Mauch <jared at puck.nether.net> wrote:

> What version of IOS-XR?  What are the interface MTUs?
>
> There were a number of TCP enhancements that went in around the 5.1
> timeframe which impact the way window scaling works as well.
>
> Also, do you have path-mtu enabled on all the devices?
>
> on XR you want something like this:
>
> tcp selective-ack
> tcp window-size 65535
> tcp path-mtu-discovery
>
> IOS:
>
> ip tcp path-mtu-discovery
> ip tcp window-size 65535
>
> - Jared
>
> > On Apr 28, 2015, at 12:46 PM, Jordi Magrané Roig <
> jordimagrane at hotmail.com> 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?
> >
> > Thanks,
> > Jordi.
> >
> >
> >
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