nanog mailing list archives
Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs
From: Dave Temkin <davet1 () gmail com>
Date: Wed, 10 Nov 2010 13:34:31 -0800
David Freedman wrote:
e.We will need to set up a L2TPV3 tunnel to their old location (single homed, no BGP on that side). Upon initial reading of Cisco docs to do this, we will need a routable IP on a loopback interface for starters.I'm pretty sure this is just a recommendation based on good practise (routeability to endpoints), I'm sure since you are not multihomed you can just use "ip local interface WAN1" and be done with it, I seem to remember doing something similar in an l2tpv3 pw class and it working.Using one from the /24 LAN is out unless we subnet it, which we don't want to do. So the question is, can I just "move" the PTP IP address x.x.129.174 from the WAN interface to the loopback like this? interface Loopback0 ip address x.x.129.174 255.255.255.252 (that's the mask we're using on the WAN- Cisco's loopback examples show .255) interface WAN1 (actually a gigether) ip unnumbered loopback0 (or no ip addr?) neighbor x.x.128.173 update-source Loopback0No, if you were to do this you should get a new transfer network, you can't have the same address on two interfaces (and in fact, you should really be stealing an address from your internal /24 which doesn't require any re-subnetting (if you are happy for this address to be unreachable) and it should have a /32 mask...
That's not correct. From a VZ IP circuit that I have: interface Loopback0ip address x.x.x.x 255.255.255.255 (actual assigned mask is 255.255.255.252)
interface Serial0/0/0 bandwidth 1536 ip unnumbered Loopback0 ip route 0.0.0.0 0.0.0.0 Serial0/0/0 Works great for me across ~50 sites. -Dave
Current thread:
- Ciscos, BGP, L2TPV3 pseudowires and loopback IPs James Smallacombe (Nov 10)
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs David Freedman (Nov 10)
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs Dave Temkin (Nov 10)
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs James Smallacombe (Nov 11)
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs Jack Bates (Nov 11)
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs Dave Temkin (Nov 10)
- RE: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs Jeff Saxe (Nov 11)
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs David Freedman (Nov 11)
- RE: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs Ryan Finnesey (Nov 11)
- RE: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs Seth (Nov 11)
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback IPs David Freedman (Nov 10)
- <Possible follow-ups>
- Re: Ciscos, BGP, L2TPV3 pseudowires and loopback Ips David Freedman (Nov 10)
- RE: Ciscos, BGP, L2TPV3 pseudowires and loopback Ips nanog (Nov 11)