On 9 December 2010 16:32, Thuo Wilson <lixton@gmail.com> wrote:

On 9 December 2010 16:14, Thuo Wilson <lixton@gmail.com> wrote:

On 9 December 2010 16:12, Thuo Wilson <lixton@gmail.com> wrote:

On 8 December 2010 18:24, <tonnie@swiftkenya.com> wrote:
Hi Skunks

I?m trying to configure auto-failover between KDN and Safcom links, with KDN being the primary. My router config is as below

Interfaces

interface GigabitEthernet0/0
description LAN
ip address 192.168.7.1 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/1
Description KDN Link
ip address 172.220.70.34 255.255.255.252
duplex auto
speed auto
!
interface FastEthernet0/0/0
description Link to Safaricom
ip address 172.30.6.182 255.255.255.252
duplex auto
speed auto
!

BGP Config

router bgp 65200
no synchronization
bgp log-neighbor-changes
network 132.147.160.0 mask 255.255.255.0
network 172.16.0.0 mask 255.255.255.0
network 192.168.7.0
timers bgp 30 45
neighbor 172.30.6.181 remote-as 37061
neighbor 172.30.6.181 ebgp-multihop 3
neighbor 172.30.6.181 update-source FastEthernet0/0/0
neighbor 172.30.6.181 weight 100
neighbor 172.30.6.181 prefix-list INSECTA-ROUTE out
neighbor 172.220.70.33 remote-as 65160
neighbor 172.220.70.33 ebgp-multihop 3
neighbor 172.220.70.33 update-source GigabitEthernet0/1
neighbor 172.220.70.33 weight 1000
neighbor 172.220.70.33 prefix-list INSECTA-ROUTE out
no auto-summary
!

mix, route-maps, AS-PATH and IP SLA ().

OOPPS - PREPEND AS not AS-PATH !

E&OE .

Further, see a sample to suit your need.

If you want to monitor P2P links only using SLA try monitor a providers DNS/KNOWN IP on their network eg, since KDN is primary. Do as follows;

(btw depending on IOS the command interpretation varies)

ip sla monitor 10
type echo protocol ipIcmpEcho 172.220.70.33 source-ipaddr 172.220.70.34            === icmp echo with src address
timeout 500                         ====== delay b4 timeout
frequency 3      =====    (if host doesnt respond in 1.5 seconds, jipange na backup)
ip sla monitor schedule 10 start-time now === self explanatory

Then: TELL the router to check this

ip route 41.220.238.4 255.255.255.255 172.220.70.33 track 10      ====note track!      (SLA ID?)

route 0.0.0.0 0.0.0.0 172.220.70.33
route 0.0.0.0 0.0.0.0 172.30.6.181   100 ==== Note the distance, means if primary has been detected to go down, insert this as primary on routing table.

router bgp XXXX

neighbor 172.30.6.181 weight 1000 <PREFERED>

neighbor 172.30.6.181 route-map KDN-PRIMARY out

neighbor 172.220.70.33 weight 100 <BACKUP>

neighbor 172.220.70.33 route-map SAFCOM-BACKUP out

ip prefix-list KDN seq 5 permit 132.147.160.0/24

ip prefix-list KDN seq 500 deny 0.0.0.0/0

ip prefix-list SAFCOM seq 5 permit 132.147.160.0/24

ip prefix-list SAFCOM seq 500 deny 0.0.0.0/0

route-map KDN-PRIMARY permit 20

match ip address prefix-list SAFCOM

set as-path prepend xxxx xxxx xxxx (3 or more times)

route-map SAFCOM-BACKUP permit 10

match ip address prefix-list KDN

set as-path prepend xxx (or more but not exceeding the above)

(The above takes care of BGP route only if uplink is responding)

E&OE.

Wilson.

Wilson.

When I shut down KDN interface, Safcom link picks up traffic, but when I bring up the KDN interface, it doesn?t come as primary until I shut down Safaricom. I have given KDN link the required weight.

Could there be a syntax I have missed out?

Regards
Anthony

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