Re: OpenBGPD dropping neighbor on VPNv4 NLRI withdraw

On Wed, Jan 31, 2018 at 11:58:19AM +0000, Job Snijders wrote:
> On Wed, Jan 31, 2018 at 09:41:55AM +0000, Stuart Henderson wrote:
> > Question is why the prefixlen is set this way...
> > [snip]
> > Type Code: MP_UNREACH_NLRI (15)
> > Length: 19
> > Address family identifier (AFI): IPv4 (1)
> > Subsequent address family identifier (SAFI): Labeled VPN Unicast (128)
> > Withdrawn routes (16 bytes)
> > BGP Prefix
> > > Prefix Length: 120
> > Label Stack: 0 (withdrawn)
> > Route Distinguisher: 56028:130
> > MP Unreach NLRI IPv4 prefix: 100.64.0.42
>
> For prefix 100.64.0.42, you'd think the only valid mask is 31 or 32.
> Perhaps this is a bug in IOS XE?

I went off the wrong track. I think this is the encoding described in
https://tools.ietf.org/html/rfc8277#page-12

Kind regards,

Job