If I understand you correctly you are trying to ping from a host on your network, not the directly connected router? If you haven't turned up BGP yet the return traffic is going to try to go back through the L3 network to your network because it's not yet receiving the directly-connected route. You will only be able to ping from the directly connected router until you turn up BGP.
If I'm not understanding what you're trying to do just ignore me. :-) Mike > -----Original Message----- > From: cisco-nsp-boun...@puck.nether.net [mailto:cisco-nsp- > boun...@puck.nether.net] On Behalf Of Drew Weaver > Sent: Thursday, September 09, 2010 10:10 AM > To: 'Jon Lewis' > Cc: cisco-nsp > Subject: Re: [c-nsp] Quick routing question. > > Hi, > > > I assume the new connection doesn't have BGP turned up yet? > -- > Correct, I am just trying to get it to where I can ping it first (which is what I > usually do, anyway). > > > Ah...but when you do this, are you sure x.x.x.13 is really the other side > of your 10G connection? This is ethernet, so when you try to ping > x.x.x.13 from your router, it sees a route for x.x.x.12/30 via the 10G > Level3 interface, and sends an arp request for x.x.x.13. If Level3's end isn't > actually configured for the /30 you are, they're not going to reply to > that arp...and maybe the x.x.x.13 you're looking for really is in use > somewhere else on their network? > -- > All valid points, when I trace route to .13 from the host that can ping it I see: > > [r...@vmz bin]# tracert x.x.x.13 > traceroute to x.x.x.13 (x.x.x.13), 30 hops max, 40 byte packets > 1 gw (gw) 0.486 ms 0.458 ms 0.463 ms > 2 core (core) 0.460 ms 0.710 ms 0.709 ms > 3 rtr (rtr) 0.427 ms 0.428 ms 0.425 ms > 4 x.x.x.Level3.net (x.x.x.13) 3.238 ms 3.238 ms 3.236 ms > > However, I can't know whether the return traffic is coming back in on that > connection, or not. > > Are you redistributing x.x.x.12/30 into > your IGP, or might those packets be going out the old connection? > -- > Yes, and see above. > > What's show ip arp on your router show you? > -- > rtr#sh ip arp > Protocol Address Age (min) Hardware Addr Type Interface > Internet x.x.x.14 - xxxx.xxxx.a9dc ARPA GigabitEthernet2/1/0 > Internet x.x.x.13 14 xxxx.xxxx.4d7a ARPA GigabitEthernet2/1/0 > Internet x.x.x.12 - xxxx.xxxx.a9dc ARPA GigabitEthernet2/1/0 > > (Ignore the 'gigabit' part, on 12000s for some reason they never changed the > interface names). > > thanks, > -Drew > > > _______________________________________________ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/