06-04-2014 10:28 PM - edited 03-07-2019 07:38 PM
Hi,
I have a public ip pool for my servers to be on internet and I have a internet connectivity from 2 ISPs.
I want to achieve following:
1.I want to advertise my public block on the internet.
2.I want internet connectivity from both isp but in primary/secondary manner.
3.I dont want to receive bgp routing table from both isp.
Kindly help with the config required on my end
06-05-2014 11:15 AM
Hi,
Couple of questions..
1.Your ISP supports BGP?
2. You have /24 subnet? If not check with your ISPs first as most ISPs does not advertise subnets lless than /24.
3.Try to get your own Autonomous system number (AS#) from ARIN. If not, some ISPs work with private AS# as well.
Check the below links for different scenarios..
http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/23675-27.html
http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html
hth
MS
06-05-2014 08:54 PM
Hi,
I have a /26 subnet with private AS# and both ISP support bgp.
I want to advertise my subnet to the world so that anyone can reach my servers on internet.
However i don't want to receive bgp routing table from my ISP but want my users to get internet.
How to achieve this?
Regards
06-08-2014 01:32 AM
Hi,
Advertise your /26 in your BGP peering with the ISPs and have them send you a default route.
This way, you only have a default route in your routing table pointing to the providers.
HTH
06-08-2014 02:14 AM
Hello
You can also make sure of this by only allowing a default route into your network
ip prefix-list default-route permit 0.0.0.0/0
ip prefix-list default-route deny 0.0.0.0/0 le 32
ip as=path access-list 1 permit ^$
router bgp xxx
Network x.x.x.x 255.255.255.192 ( your 26 advertised subnet)
neighbour (isp1 next hop) prefix-list default-route in
neighbour (isp2 next hop) prefix-list default-route in
neighbour (isp1 next hop) filter-list 1 out ( prohibit transit routes Between isp1 and isp2
neighbour (isp2 next hop) filter-list 1 out ( prohibit transit routes between isp2 and isp1)
res
Paul
06-08-2014 08:32 AM
06-08-2014 08:59 AM
The ISP will advertise a default route using the BGP peering with you. You then follow that default route to get to Internet
HTH
06-07-2014 09:50 PM
Thanx 4 d sharing the links....it solved my queries a lot....
Cheers....!!!!!!!!
06-08-2014 08:55 AM
Hello
please rate any posts that have been helpfull
thanks
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