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Re: Does anyone multihome anymore?
by Mike Tancsa 22 Aug '07

22 Aug '07

At 10:11 AM 8/22/2007, Paul Kelly :: Blacknight Solutions wrote: >Mike Tancsa wrote: > > > > At 03:49 AM 8/22/2007, Security Admin (NetSec) wrote: > > > >> Pardon my forwardness, but don't people just multi-home these days? > >> If your > > > > Multihoming is great for when there is a total outage. In the case of > > Cogent on Monday, it wasnt "down"... In this case, there is only so much > > you can do to influence how packets come back at you as BGP doesnt know > > anything about a "lossy" or slow connections. > > > > ---Mike > >Take the carrier that is causing you issues out of your eBGP setup and >all's well.... Hi, In my case, I have 6453 and 174 for transit. I want to get to 577 which is directly connected to 6453 and 174. 577 has a higher local pref on paths via 174. Short of shutting my 174 session (or some deaggregation), I dont have a way to influence how 577 gets back to me. I can easily exit out 6453, but it does nothing for the return packets. I have enough capacity on 6453 to handle all my traffic, but its a Draconian step to take and some traffic via 174 is fine and would be worse if I fully shut the session. (ie. peers of 174 in Toronto) ---Mike

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RE: Does anyone multihome anymore?
by Mike Tancsa 22 Aug '07

22 Aug '07

At 10:31 AM 8/22/2007, David Hubbard wrote: >That's because Cogent has chosen to not give us the BGP communities Actually, in my case I dont think it would help because 577 has some sort of paid agreement with teleglobe and probably a very cheap (or even zero $$$) agreement with Cogent. So I dont think they would let me influence their exit path to make them pay Teleglobe more money :) But yes, community tickery can be quite helpful, but it wont always do the trick. ---Mike

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CIsco Ons Questions
by Andrew Matthews 22 Aug '07

22 Aug '07

I have a few questions regarding a Cisco ONS. 1. Are there Channelized OC cards for the ONS? or are they just raw ports that can be done anyway needed? And if so are there OC3 and OC12 Channelized? 2. If 1 is true, can the ONS mux circuits? For example; Can i take 2 OC3s on one side, and mux them into one large OC12? 3. If all are true, what oc3 and what oc12 card is needed? and i think its the IR since i'm not going over 70km between the ons and the connecting device. Thanks Andrew

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Telefonica network contacts to resolve reachability issues.
by David Ulevitch 22 Aug '07

22 Aug '07

Is anyone from Telefonica around that can help debug some technical issues regarding reachability to a number of prefixes across a few ASs? The contact info on puck.nether.net bounces and info(a)us.telefonica.com is a bitbucket from all outward appearances. This has been going on for at least a month with no fix or reply to emails. Here are some example IPs that aren't reachable: (host, asn, ip) ns1.everydns.net | 15135 | 208.76.56.56 ns2.everydns.net | 3557 | 204.152.184.150 ns3.everydns.net | 26228 | 208.96.6.134 ns4.everydns.net | 3356 | 64.158.219.3 Thanks. David Ulevitch EveryDNS 415 287 7721

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Re: For want of a single ethernet card, an airport was lost ...
by leeyao＠trashymail.com 22 Aug '07

22 Aug '07

The government is completely incompetent. Public schools are in horrible condition, government networks constantly get failing or D grades, and on top of all this President Bush insists the Iraq war is necessary. What bull...I\'m surprised a member of the press hasn\'t killed Bush..

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RE: Does anyone multihome anymore?
by David Hubbard 22 Aug '07

22 Aug '07

From: Mike Tancsa > > Hi, > In my case, I have 6453 and 174 for transit. I want to get to 577 > which is directly connected to 6453 and 174. 577 has a higher local > pref on paths via 174. Short of shutting my 174 session (or some > deaggregation), I dont have a way to influence how 577 gets back to > me. I can easily exit out 6453, but it does nothing for the return > packets. I have enough capacity on 6453 to handle all my traffic, > but its a Draconian step to take and some traffic via 174 is fine and > would be worse if I fully shut the session. (ie. peers of 174 > in Toronto) That's because Cogent has chosen to not give us the BGP communities needed to influence traffic destined to you from their other peers. They're one of the providers I use and I just turn them off when they are having issues. With Level 3, for example, I can path prepend to just certain remote AS's, etc., it's nice to have that control. Dave

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Re: Does anyone multihome anymore? (was: Re: Cogent latency / congestion)
by Mike Tancsa 22 Aug '07

22 Aug '07

At 03:49 AM 8/22/2007, Security Admin (NetSec) wrote: >Pardon my forwardness, but don't people just multi-home these days? If your Multihoming is great for when there is a total outage. In the case of Cogent on Monday, it wasnt "down"... In this case, there is only so much you can do to influence how packets come back at you as BGP doesnt know anything about a "lossy" or slow connections. ---Mike

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Transatlantic Ethernet suggestions (London - Toronto)
by Simon Lockhart 22 Aug '07

22 Aug '07

Hi, I'm in the process of building a new network, and have a requirement for an ethernet link between London (Telehouse, Redbus Sovereign, or Interxion), and Telehouse Canada (151 Front St, Toronto). I'm looking for either a 10M link, or (if the price is good) fractional 100M (e.g. 30M). I've already got pricing from Hibernia (EoTDM), and Cogent (EoMPLS), but does anyone have any recommendations for who else should be able to provide this? Does anyone have any experiences (good or bad) of Cogent's transatlantic ethernet services that they could share with me off-list? Many thanks, Simon

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L2VPN Interworking IP Mode
by ALEJANDRO ESQUIVEL RODRIGUEZ 22 Aug '07

22 Aug '07

Hi,,, group Someone have experience with L2vpn interworking IP Mode feature with others manufacturers (Non-Cisco). I don't know,,, maybe Juniper, Alcatel-Lucent. I need a solution for interworking: C1 -- Ethernet -- ATM --- FrameRelay -- C2 C1 = Customer Site 1 C2 = Customer Site 2 Any Solution or live experience ??? Regards !!!! Alejandro Esquivel Rodriguez NOC - RACSA (506) 287-0404

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L2VPN Interworking IP Mode
by ALEJANDRO ESQUIVEL RODRIGUEZ 21 Aug '07

21 Aug '07

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