Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Blake Hudson
Stephen Satchell wrote on 9/24/2015 11:00 AM: On 09/24/2015 07:05 AM, Blake Hudson wrote: However, the ultimate way to control routing would be to advertise more specific prefixes via the path that you want traffic to flow. Tried that, no joy. I could only assume then that your peers were

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Stephen Satchell
On 09/24/2015 07:05 AM, Blake Hudson wrote: However, the ultimate way to control routing would be to advertise more specific prefixes via the path that you want traffic to flow. Tried that, no joy.

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Bob Evans
What Blake just said below works best - I do this MED together with small-ers all the way to india for video conferencing customers sitting in silicon valley. Thank You Bob Evans CTO > > > Stephen Satchell wrote on 9/24/2015 8:39 AM: >> On 09/23/2015 02:38 PM, Jason Bullen wrote: >>> I've alwa

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Jason Bullen
Thank you all for answering. I was disregarding Local Pref because the route server I was on was showing 100. That was an error on my part though as it clearly states in the login banner that it is eBGP peering with the AT&T routers hence the local Pref would go back to 100 from its perspective.

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Blake Hudson
Stephen Satchell wrote on 9/24/2015 8:39 AM: On 09/23/2015 02:38 PM, Jason Bullen wrote: I've always worked in enterprise only so I thought you guys might be able to help me with this one. We are dual homed to Verizon and AT&T. We prepend all our prefixes out AT&T to make them least preferre

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Mark Tinka
On 24/Sep/15 15:21, William Herrin wrote: > Hi Jason, > > That's normal. Verizon does it too. Both have "community" tags which > you can attach to your route advertisement. Each will have one that > indicates they should give external routes the same "local pref" as > the route you announce to th

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Stephen Satchell
On 09/23/2015 02:38 PM, Jason Bullen wrote: I've always worked in enterprise only so I thought you guys might be able to help me with this one. We are dual homed to Verizon and AT&T. We prepend all our prefixes out AT&T to make them least preferred. During a recent issue we found some users wer

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread William Herrin
On Wed, Sep 23, 2015 at 5:38 PM, Jason Bullen wrote: > So if my research is correct, the internet prefers Verizon UNLESS they are > a direct AT&T customer then they would use the AT&T circuit. > Is this a standard practice that I should assume to encounter? Hi Jason, That's normal. Verizon does

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Mark Tinka
On 23/Sep/15 23:38, Jason Bullen wrote: > I've always worked in enterprise only so I thought you guys might be able > to help me with this one. > We are dual homed to Verizon and AT&T. We prepend all our prefixes out > AT&T to make them least preferred. During a recent issue we found some > us

Re: Service Providers behaviour for dual homed enterprises

2015-09-24 Thread Clinton Work
Many transit providers support BGP communities to modify how your announced routes are treated within their network. A quick search shows that AT&T supports BGP community 7018:70 to lower the default local-pref 100 down to 70 (below peer routes). If you tag your AT&T announced routes with BGP comm

Re: Service Providers behaviour for dual homed enterprises

2015-09-23 Thread Jared Mauch
> On Sep 23, 2015, at 5:38 PM, Jason Bullen wrote: > > I've always worked in enterprise only so I thought you guys might be able > to help me with this one. > We are dual homed to Verizon and AT&T. We prepend all our prefixes out > AT&T to make them least preferred. During a recent issue we fo

Service Providers behaviour for dual homed enterprises

2015-09-23 Thread Jason Bullen
I've always worked in enterprise only so I thought you guys might be able to help me with this one. We are dual homed to Verizon and AT&T. We prepend all our prefixes out AT&T to make them least preferred. During a recent issue we found some users were coming in via AT&T. Using various looking g