BGP - Routing

[asifmohamamed]

I have configured a Two service provider BGP configuration in single router.

Configuration as given as below...

G_Ware#sh running-config | s route

router bgp 64515
 no synchronization
 bgp log-neighbor-changes
 network 10.103.0.0 mask 255.255.240.0
 neighbor 10.0.0.109 remote-as 10201------------------------------------SP 1
 neighbor 10.0.0.109 update-source GigabitEthernet0----------------SP 1
 neighbor 192.168.136.177 remote-as 9583-----------------------------SP 2
 neighbor 192.168.136.177 update-source FastEthernet8.162-----SP2
 no auto-summary

G_Ware#Sh ip route

Gateway of last resort is 192.168.136.177 to network 0.0.0.0

B*    0.0.0.0/0 [20/0] via 192.168.136.177, 2d01h
      10.0.0.0/8 is variably subnetted, 80 subnets, 5 masks
B        10.0.0.2/32 [20/0] via 10.0.0.109, 2d01h
B        10.0.0.28/30 [20/0] via 192.168.136.177, 06:58:42
C        10.0.0.108/30 is directly connected, GigabitEthernet0
L        10.0.0.110/32 is directly connected, GigabitEthernet0
B        10.0.0.120/30 [20/0] via 192.168.136.177, 06:58:42

B        10.180.80.0/20 [20/0] via 192.168.136.177, 2d01h
B        10.180.160.0/20 [20/0] via 192.168.136.177, 2d01h
B        10.182.0.0/20 [20/0] via 192.168.136.177, 2d01h
B        10.182.32.0/20 [20/0] via 192.168.136.177, 2d01h
B        10.184.0.0/20 [20/0] via 10.0.0.109, 2d01h-----------------My Router Learns SP2 Networks through SP1(instead of learning through SP2)
B        10.184.32.0/20 [20/0] via 192.168.136.177, 06:58:09
B        10.186.48.0/20 [20/0] via 192.168.136.177, 2d01h

How to restrict above issue and also i require my router wants to learn SP1 network via SP1 and SP2 network via SP2.

I have attached configuration of Router along with ip route status

Thanks in advance

Asif

[Jon Marshall]

What does a "sh ip bgp 10.184.0.0 255.255.240.0" show ?

If that subnet belongs to ISP2 then the route advertised from ISP2 should have a shorter AS path.

Jon

[asifmohamamed]

Find a below output after check with sh ip bgp 10.103.0.0 255.255.240.0 command....

G_Ware#sh ip bgp 10.103.0.0 255.255.240.0
BGP routing table entry for 10.103.0.0/20, version 21
Paths: (1 available, best #1, table default)
  Advertised to update-groups:
     2
  Local
    0.0.0.0 from 0.0.0.0 (192.168.136.178)
      Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced, loca
l, best

[Jon Marshall]

I don't understand what you have posted.

The output is for your 10.103.0.0 255.255.240.0 subnet but I thought you were asking about the subnet you highlighted in your original post ie. 10.184.0.0 255.255.240.0.

Jon

[asifmohamamed]

Sorry, by mistake I have posted output for 10.103.0.0 255.255.240.0

Kindly find a output 10.184.0.0 255.255.240.0

G_Ware#sh ip bgp 10.184.0.0 255.255.240.0
BGP routing table entry for 10.184.0.0/20, version 69
Paths: (1 available, best #1, table default)
  Advertised to update-groups:
     2
  10201 65500
    10.0.0.109 from 10.0.0.109 (202.148.199.122)
      Origin IGP, localpref 100, valid, external, best

Thanks

Asif

[Jon Marshall]

Is this an MPLS network ?

Jon

[asifmohamamed]

SP 1- MPLS VPN

SP 2- MPLS

[Jon Marshall]

According to your output you are not receiving an advertisement from ISP2 for that subnet.

Are you sure you are advertising that subnet to both ISPs at the remote site ?

What do you mean by just MPLS ?

Jon