BGP Massive (Hundred Thousand Prefixes)Received Routes - route-map issue

[arnoldsotis110882]

Hi Everyone,

Good day!

May I asked your expertise in BGP... Our small company decided to have two different ISPs. ISP1 and ISP2.

Now, our network is multihomed but I AM HAVING PROBLEM FROM ISP2. I AM RECEIVING HUNDRED THOUSANDS OF PREFIXES AND IT UTILIZES THE CPU of my router.

Can anyone help me on this... I really appreciate it. Below is my sample config, i am not sure on the route-map i applied in ISP2. Please help!

Sample config...

RTR1#sh run | sec router bgp

router bgp xx80

bgp log-neighbor-changes

neighbor a.a.a.a remote-as aaa   <<---- ISP2

neighbor b.b.b.b remote-as bbb    <<--- ISP1

neighbor b.b.b.b ebgp-multihop 3

!

address-family ipv4

  no synchronization

  network x.x.x.x mask 255.255.248.0

  network a.a.a.a mask 255.255.255.252

  neighbor a.a.a.a activate

  neighbor a.a.a.a prefix-list To_ISP2_BGP out

  neighbor a.a.a.a route-map ISP2_OUT in

  neighbor a.a.a.a route-map ISP2_IN out

  neighbor b.b.b.b activate

  neighbor b.b.b.b soft-reconfiguration inbound

  neighbor b.b.b.b prefix-list To_ISP1_BGP out

  no auto-summary

exit-address-family

ip as-path access-list 10 permit ^$

!

!

route-map ISP2_OUT permit 10

match as-path 10

set origin igp

!

route-map ISP2_IN permit 10

set local-preference 200

Thank you,

Arnold

[smitesh kharecha]

Hi Arnold,

Best thing you can do is to ask your ISP to provide you only default route, if you don't need whole/partial routing table.

Or else, make a route-map which filters out all the routes which you receive from ISP, which you don't want.

HTH,

Smitesh

[arnoldsotis110882]

Thank you smitesh... I will consider it as part of my action.

Thank you.

[smitesh kharecha]

Hi Arnold,

Kindly close the thread, if you think your concern is answered, so that other community members don't have to come to this thread and then find it already to be answered..

HTH,

Smitesh