Also sprach Jeff Binkley

Thanks. I was really looking for the amount of network bandwidth, not how much memory it takes. I've already started the upgrade from 64-128 megs.

Once a BGP session is stabilized, it really uses *very* little network bandwidth. As a data point, it takes about a minute to a minute and a half to sync up a full BGP view over a T1 (someone that's checked this more recently than I might want to correct me if necessary), obviously, as you drop down bandwidth from there, the time will go up...that should give you a good data point to start with though. Once the initial sync is done, normal operation of BGP uses a miniscule amount of bandwidth. The only data that is transfered over the BGP session is route updates, meaning information is only really sent when a route changes, appears or disappears. I'm sure you can imagine that for a typical multi-homed ISP or customer, these changes will not be significant. FWIW, on my backup T1's (meaning the only traffic on them should *only* be BGP updates) the traffic rate is almost unmeasurable as far as the Cisco 5 minute input/output rate is concerned. I occasionally see them show 1000 bits/sec, 1 packets/sec, but only very briefly. It uses *that* little of traffic. -- Jeff McAdams Email: jeffm@iglou.com Head Network Administrator Voice: (502) 966-3848 IgLou Internet Services (800) 436-4456 - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.

On Mon, 15 May 2000, Jeff Mcadams wrote:

Also sprach Jeff Binkley

...

A few weeks back there was a discussion here on the amount of memory required for a Cisco router running in a multihomed environment and BGP4. The recommendation was 128M of memory. I am interested in how much bandwidth into the Internet folks are seeing BGP4 use in this type of environment. Is it a significant amount ? Can someone put a quantity around it ?

You can run 2 full views in 64megs of ram...its rather tight though, so 128megs is definitely recommended.

We're fitting 3 full views into a 64 meg 3620, but just barely -- only about 5 meg free, and CPU is running around 40%. DON'T try this at home, kids; we're ONLY doing it because the 7206VXR we ordered is backordered and our UUNET T1 showed up early. I'm surprised it actually worked, really. But at the rate the table's growing, that 5 meg will be gone by the end of the summer. A 3640 should be considered the rock bottom minimum these days, and a 3661 or 7100 or 7200 would give a lot more breathing room. We went 7206VXR to get away from external CSU/DSU's -- cramming a ton of WIC-1DSU-T1's into a 3661 would have been ugly and not very efficient use of the available slots... plus we can put T3's into it later as we need them. BGP itself doesn't take much bandwidth, and bandwidth doesn't affect memory usage. It might affect CPU usage, though. We're pushing about 2 megabits of backbone traffic into that 3620 and back out the other side to some internal T1/ethernet links. Mike Andrews (MA12) * mandrews@dcr.net * http://www.bit0.com/ VP, sysadmin, & network guy, Digital Crescent Inc, Frankfort KY Internet services for Frankfort, Lawrenceburg, Owenton, Shelbyville www.fark.com: If it's not news, it's Fark. (Or something like that.) - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.

Paul, Thanks. I was more interested in network bandwidth than router memory. Jeff Binkley ASA Network Computing -> If you are taking full routes.. then yes. I did bgp to my upstream (C&W) -> with only 48Mb installed. I only took a few routes though. -> -> Paul Farber -> Farber Technology -> farber@admin.f-tech.net -> Ph 570-628-5303 -> Fax 570-628-5545 -> -> On Mon, 15 May 2000, Jeff Binkley wrote: -> -> > -> > A few weeks back there was a discussion here on the amount of memory > -> required for a Cisco router running in a multihomed environment and > BGP4. -> The recommendation was 128M of memory. I am interested in > how much -> bandwidth into the Internet folks are seeing BGP4 use in > this type of -> environment. Is it a significant amount ? Can someone > put a quantity -> around it ? -> > -> > Thanks, -> > -> > Jeff Binkley -> > ASA Network Computing -> > -> > - -> > To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" > -> with "unsubscribe usr-tc" in the body of the message. -> > For information on digests or retrieving files and old messages send > -> "help" to the same address. Do not use quotes in your message. > - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.