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jay
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Post subject: BGP question | Posted: Thu Jun 02, 2016 1:14 pm |
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Joined: Wed Jun 01, 2016 11:06 am Posts: 3
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BGP question
Hello Everyone, i have situation where i'm receiving a /26 subnet via CPE router and i only want to advertise /29 subnet to EBGP. is there any way to do that? i can't advertise whole /26 as it breaks other customer. Note: /29 prefix does not live on the box so i can't advertise them directly. Any help would be highly appreciated. Note: Using Juniper MX box so far what i did is static { route 24.206.51.32/29 { receive; no-install; } } So the /29 would be in RIB but not used for forwarding decisions. i advertised /29 prefix from RIB to EBGP. but would /29 never advertised-------> didn't work this solution. 2nd try. I create static /29 route point toward CPE and advertised /29 prefix to ebgp but again would never advertised----> didn't work Thanks, Jay
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admin
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Post subject: Re: BGP question | Posted: Thu Jun 02, 2016 3:50 pm |
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Site Admin
Joined: Mon Aug 03, 2009 8:43 am Posts: 104
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SOmething you're not doing right. On 1st try (first options), do a "show route advertising-protocol bgp <neighbor IP>". I assume you have proper export policies in place, don't you ?
_________________ VPSie - SSD VPS servers in AMS-IX, LINX, DE-CIX https://vpsie.com
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admin
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Post subject: Re: BGP question | Posted: Thu Jun 02, 2016 3:53 pm |
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Site Admin
Joined: Mon Aug 03, 2009 8:43 am Posts: 104
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Also give up the "receive" keyword. It will instruct the PFE to send all transit traffic for that route to the routing engine and, trust me, you don't want that.
_________________ VPSie - SSD VPS servers in AMS-IX, LINX, DE-CIX https://vpsie.com
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admin
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Post subject: Re: BGP question | Posted: Thu Jun 02, 2016 3:57 pm |
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Site Admin
Joined: Mon Aug 03, 2009 8:43 am Posts: 104
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jay
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Post subject: Re: BGP question | Posted: Fri Jun 03, 2016 10:20 am |
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Joined: Wed Jun 01, 2016 11:06 am Posts: 3
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Yes i do have proper export policy.
show route protocol bgp advertising-protocol bgp 22.172.67.162 CPE-MGMT.L3VPN.inet.0: 13093 destinations, 26217 routes (13093 active, 0 holddown, 0 hidden) Prefix Nexthop MED Lclpref AS path * 22.42.182.0/25 Self 7843 20001 I * 22.141.178.0/24 Self 7843 10796 I * 22.205.63.0/24 Self I * 22.212.194.0/24 Self 7843 11351 I * 51.83.225.0/24 Self 7843 11427 I
I gave up receive command as well but it would never advertised to ebgp peer.
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jay
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Post subject: Re: BGP question | Posted: Fri Jun 03, 2016 10:34 am |
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Joined: Wed Jun 01, 2016 11:06 am Posts: 3
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Yes i do have proper export policy. i gave up "receive" keyword and try to advertise again but it would never advertise to ebgp peer.
show route protocol bgp advertising-protocol bgp 22.172.57.161 CPE.L3VPN.inet.0: 19033 destinations, 21627 routes (19033 active, 0 holddown, 0 hidden) Prefix Nexthop MED Lclpref AS path * 22.33.172.0/25 Self 3487 40001 I * 22.132.168.0/24 Self 3487 10697 I * 22.206.53.0/24 Self I * 22.203.184.0/24 Self 3487 15311 I * 52.74.205.0/24 Self 3487 11247 I
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admin
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Post subject: Re: BGP question | Posted: Fri Jun 03, 2016 11:54 am |
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Site Admin
Joined: Mon Aug 03, 2009 8:43 am Posts: 104
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Please post your bgp configuration, export policy as well as routing-options for the relevant VRF.
_________________ VPSie - SSD VPS servers in AMS-IX, LINX, DE-CIX https://vpsie.com
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