RE: [isp-bgp] BGP Newbie Help - Config Review

["Chris Hale" <chris@...>]

Do you have those routes active in your routing database?  Your BGP won't
advertise them unless they're active.  Use either a static blackhole route
or make sure they are available in your local routing database.

I would only accept a default from UUNet and Sprint.  Then do a local
preference of the defaults from UUNEt with a preference of 110 (default is
100, which is what Sprint will come in as).  Then, as long as your BGP
session is up with UUNet, your traffic will exit your network via UUNet.  In
the case of failover, your Sprint default with a preference of 100 will be
the only route left, and all traffic will exit via Sprint.

The other thing to do is to prepend your outgoing routes to Sprint 2-3x, or
whatever is necessary to ensure all traffic enters your network via UUNet.
You can do this either with communities, or a route-map.

Chris

**-----Original Message-----
**From: Jim Barstow [mailto:jimb-clec@...]
**Sent: Tuesday, March 22, 2005 12:13 PM
**To: isp-bgp@isp-bgp.com
**Subject: RE: [isp-bgp] BGP Newbie Help - Config Review
**
**Pete,
**
**The outbound and inbound traffic will traverse UUNet primarily, then
**should
**traverse Sprint in the event of a failover.
**In a static routing world, I would...
**0.0.0.0/0 -> UUNet
**0.0.0.0/0 -> Sprint Metric 2
**
**
**Regarding mask lengths, I have the supernet entered in my router as 2
**/24s,
**do I need to advertise them like this?
**204.180.198.0/24
**204.180.199.0/24
**63.169.171.0/24
**
**So now I have...
**---snip---
**!******************************
**!BGP
**!******************************
**!SmartTel-BCI ASN: XXXXX
**router bgp XXXXX
** no synchronization
** network 204.180.198.0 mask 255.255.255.0
** network 204.180.199.0 mask 255.255.255.0
** network 63.169.171.0 mask 255.255.255.0
**!
** neighbor sprint peer-group
** neighbor sprint distribute-list 30 out
** neighbor sprint remote-as 1239
** neighbor sprint version 4
** neighbor sprint send-community 1239:90
** neighbor sprint maximum-prefix 75000
**!
** neighbor 144.232.213.21 description Sprint PL#434501
** neighbor 144.232.213.21 peer-group sprint
** neighbor 144.232.213.21 shutdown
**!
** neighbor 144.232.213.5 description Sprint PL#434382
** neighbor 144.232.213.5 peer-group sprint
** neighbor 144.232.213.5 shutdown
**!
** neighbor 157.130.69.189 description UUNet
** neighbor 157.130.69.189 remote-as 701
** neighbor 157.130.69.189 version 4
** neighbor 157.130.69.189 distribute-list 30 out
** neighbor 157.130.69.189 send-community 701:100
** neighbor 157.130.69.189 maximum-prefix 170000
** neighbor 157.130.69.189 shutdown
** no auto-summary
**!
**!******************************
**!BGP Access Lists
**!******************************
**!BGP Lists 30-39
**access-list 30 permit 204.180.198.0 0.0.254.255
**access-list 30 permit 63.169.171.0 0.0.0.255
**access-list 30 deny any
**---snip---
**
**------------------------------------
**SmartTel Communications
**Jim Barstow
**Sr. Telecom Engineer
**jimb@...
**PO Box 367
**22645 Canal Road
**Suite E
**Orange Beach, AL 36561
**tel: (251) 224-0868
**fax: (251) 224-0830
**mobile: (251) 747-4913
**------------------------------------
**
**
**-----Original Message-----
**From: Pete Templin [mailto:petelists@...]
**Sent: Tuesday, March 22, 2005 10:40 AM
**To: isp-bgp@isp-bgp.com
**Subject: Re: [isp-bgp] BGP Newbie Help - Config Review
**
**Jim Barstow wrote:
**
**> Below is the config I have, but I don't think it is correct. I would
**> like a little help fixing it to do what its supposed to.  First, a
**> little topology; I have 2 T1s to Sprint AS1239 Atlanta that are to be
**> load balanced as a secondary route, and a T3 to UUNet AS701 that is to
**> be primary route for both inbound and outbound traffic.  I plan on
**> getting full routes from UUNet and No routes from Sprint (is this
**> recommended?  Otherwise, I could get partial routes from sprint)
**
**How will you handle outbound traffic failover?  Get default from Sprint?
**  Get default from UUNet?  Manual default to Sprint?
**
**> I have the following netblocks currently that I need to advertise:
**> 204.180.198.0/23
**> 63.169.171.0/24
**
**Are they in your router at the exact mask length?
**
**> If anyone could be so helpful as to take a look and let me know what I
**> should change to make everything kosher, that would be great.
**
**[I would group the two Sprint neighbors into a peer group.]
**
**>  neighbor z.z.z.z description UUNet ASN701  neighbor z.z.z.z remote-as
**> 701  neighbor z.z.z.z version 4  neighbor z.z.z.z distribute-list 30
**> out  neighbor z.z.z.z send-community 701:110  neighbor z.z.z.z
**> maximum-prefix 150000 warning-only
**
**I don't think 701:110 is a valid UUNet community.  I think it's only
**701:80,
**701:100, 701:120, and then 701:1, 701:2, 701:3 for prepends.
**
**Also, I see that your max-prefix line is warning-only, but it'll be
**essentially useless except to tell you the session is up.  I'm getting
**154729 prefixes from them at this moment.
**
**pt
**
**
**


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