[f-nsp] VRRP-E in combination with Route-Maps

[A. Krijgsman - QCC]

Re: [f-nsp] VRRP-E in combination with Route-MapsAll Full
  ----- Original Message ----- 
  From: Joseph Jackson 
  To: A. Krijgsman - QCC ; foundry-nsp at puck.nether.net 
  Sent: Sunday, February 26, 2006 6:58 PM
  Subject: RE: [f-nsp] VRRP-E in combination with Route-Maps


  ? 
  What type of routes are you getting from your providers? Full? Default route?


------------------------------------------------------------------------------
  From: foundry-nsp-bounces at puck.nether.net on behalf of A. Krijgsman - QCC
  Sent: Sun 2/26/2006 4:17 AM
  To: foundry-nsp at puck.nether.net
  Subject: Re: [f-nsp] VRRP-E in combination with Route-Maps


  Dear Gunther / All,

  That would have been my first guess as well.
  However when I try the bgp route to my provider B. (Below are my real
  results.)
  You will see it takes the longer AS-path trough provider A to the provider
  B. IP :-(

  Has this anything to do with the backup-priority / track-priority in VRRP-E?
  Or is this default iBGP behaviour?

  If anyone has a clue? :-)

  Kind regards,
  Armand

  ++++++++++++++++++++++++ MY RESULT +++++++++++++++++++++++++++++++++++
  SSH at ams-gs-rt2>show ip bgp 217.170.9.139
  Number of BGP Routes matching display condition : 2
  Status codes: s suppressed, d damped, h history, * valid, > best, i internal
  Origin codes: i - IGP, e - EGP, ? - incomplete
      Network            Next Hop        Metric LocPrf Weight Path
  *>  217.170.9.0/24     84.233.188.97               100    0      8928 15412
  24785 24785 i
  *i   217.170.9.0/24     217.170.9.129               100    0      24785 i
         Last update to IP routing table: 2d1h4m16s, 1 path(s) installed:
           Gateway           Port
           84.233.188.97     v1
         Route is advertised to 1 peers:
          195.144.2.2(35829)
  ++++++++++++++++++++++++ MY RESULT +++++++++++++++++++++++++++++++++++

  ----- Original Message -----
  From: "Gunther Stammwitz" <gstammw at gmx.net>
  To: "'A. Krijgsman - QCC'" <a.krijgsman at quality-control-centre.net>;
  <foundry-nsp at puck.nether.net>
  Sent: Sunday, February 26, 2006 1:01 PM
  Subject: AW: [f-nsp] VRRP-E in combination with Route-Maps


  > Hello Armand,
  >
  > I guess you're running BGP as outside/external routing protocol, right?
  > Well... That would explain why traffic is flowing the way it is: if both
  of
  > your providers are supplying you with the same as-path-lengths for most of
  > the prefixes - this is mostly happening when both of them are of the same
  > tier-class like both are tier1 - your router is always going to prefer the
  > the external path over the internal one.
  > Example:
  > Here we can see that the network 3.0.0.0/8 can be reached in 5 as-hops.
  The
  > internal path (5.6.7.8) as well as the external one have exactly the same
  > lenght and localpref but the external one is being preferred. This is a
  > standard mechanism in bgp (ebgp over ibgp).
  >
  > *>  3.0.0.0/8          1.2.3.4                999    0      12345 3356 701
  > 703 80 i
  > *i  3.0.0.0/8          5.6.7.8    0           999    0      12345 3356 701
  > 703 80 i
  >
  > I hope this was a help.
  > Gunther
  >
  >
  >
  >


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