The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: loopback /32 mask
On Sun, Mar 18, 2001 at 01:59:21PM -0600, Raymond Cheung wrote: > I also changed the mask to /30, and the tunnel is still set up. I also > enable "ip ospf network point-to-point" under this loopback since OSPF > advertises only host route for loopbacks no matter what mask is. I also > rebooted the router, and the tunnel is still up. From the other P routers, > /30 prefix did show up instead of /32. Then I changed the TE path from > explicit path to dynamic path, the tunnel is torn down and then set up > without any problems. Right; like I said, I believe the /32 is mandatory in the specs, but we don't enforce that. I could be wrong about the mandating about the /32, but obviously we don't enforce it either way. > I just don't understand why the /32 mask should be mandatory from some Cisco > presentation. It looks like other masks work too. > They do, for TE. The funny restriction about /32s is not really about the endpoint of a tunnel, but about the next-hop for a VPN route. If you have a next-hop that's not a /32 for a VPN route, you can't guarantee that the route you *do* have (a /30 or /24 or whatever) wasn't the result of address summarization at some point. And since you can't guarantee that, then there's no way to assure you'll be able to always avoid running into an aggregate label. And since the inner label on a VPN packet has no meaning to anyone but the PEs, you don't want a P somewhere in the middle of your network trying to do a label lookup on a VPN label. Thus, the mandatory /32 for VPN next-hops. eric > -----Original Message----- > From: Raymond Cheung [mailto:rcheung@slb.com] > Sent: Saturday, March 17, 2001 4:56 PM > To: MPLS Mailing List > Subject: loopback /32 mask > > > Any particular reason for loopback to be /32 mask during RSVP-TE config? I > understand it's good to have loopback as router id or headend, or ..., but > my question is, is it mandatory that the mask should be /32? why other masks > won't work? > regards, > > ================================================ > Yinglam (Raymond) Cheung > Schlumberger Network Solutions > CCIE (R/S), CCNP+ATM, CCDP > Tel: (713) 513-3285 > 5599 San Felipe St Suite 400 > Houston, TX 77056 > Email: rcheung@slb.com > ================================================ > > ------- > The MPLS-OPS Mailing List > Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml > Archive: http://www.mplsrc.com/mpls-ops_archive.shtml > > ------- > The MPLS-OPS Mailing List > Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml > Archive: http://www.mplsrc.com/mpls-ops_archive.shtml ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml
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