Help on IP SLA configuration

[Mohd Khairul Nizam]

Hi all,

On the 1841 router (site Lot210) I would like to configure IP SLA for my WAN secondary line which is using ADSL.

Existing primary line is using BGP and connect to the HQ.

Now i want if the BGP interface is down, the secondary ADSL line take over.

Please see below,

1- Configure an IP SLA:

ip sla 1

  icmp-echo 58.139.x.x

  threshold 2000

  timeout 2000

  frequency 5

ip sla schedule 1 start now life forever

2- Create a track object:

track 1 ip sla 1 reachability

Then how about the route? i dont know what to config.

The router default route 0.0.0.0 0.0.0.0 is to the firewall (internet)

[Tagir Temirgaliyev]

I think it is better to configure second BGP neibor throw adsl line 

if you can share config I will do detailed instructions

[Mohd Khairul Nizam]

is that possible?

here i attached the existing running-config without the IP SLA

=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=
sh run
Building configuration...

Current configuration : 4019 bytes
!
version 12.4
!
!
interface FastEthernet0/0
 description ADSL WAN Interface
 no ip address
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 no ip mroute-cache
 duplex auto
 speed auto
 pppoe enable group global
 pppoe-client dial-pool-number 1
 no cdp enable
!
interface FastEthernet0/1.3
 description $ETH-LAN$
 encapsulation dot1Q 10 native
 ip address 172.7.100.254 255.255.0.0
!
interface FastEthernet0/1.4
 description VLAN for Naraya
 encapsulation dot1Q 400
 ip address 172.47.100.254 255.255.0.0
!
interface Serial0/1/0
 description Primary Line IPVPN
 ip address 58.139.x.x 255.255.255.252
 no fair-queue
!
interface Dialer1
 ip address negotiated
 encapsulation ppp
 shutdown
 dialer pool 1
 ppp authentication pap callin
 ppp pap sent-username ise@com.my password 7 055A545C7519
!
router bgp 65322
 no synchronization
 bgp log-neighbor-changes
 network 172.7.0.0
 network 172.17.0.0
 network 172.27.0.0
 network 172.47.0.0
 network 172.57.0.0
 network 172.67.0.0
 neighbor 58.139.x.xy remote-as 23736
 no auto-summary
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 172.27.17.100
!

[Tagir Temirgaliyev]

probably BGP must be like this

router bgp 65322
 no synchronization
 bgp log-neighbor-changes
 network 172.7.0.0 mask 255.255.0.0
 network 172.17.0.0  mask 255.255.0.0
 network 172.27.0.0 mask 255.255.0.0
 network 172.47.0.0 mask 255.255.0.0
 network 172.57.0.0 mask 255.255.0.0
 network 172.67.0.0 mask 255.255.0.0

and your advertised networks only 2 now

network 172.7.0.0 mask 255.255.0.0
network 172.47.0.0 mask 255.255.0.0

is this provider AS 23736 ?

you need to ask provider to give you static ip address on adsl link

and BGP neibor address on adsl link

and you will configure second BGP neighbor a.b.x.xy remote-as 23736

after that make

sh bgp nei det

I will do next config

[Mohd Khairul Nizam]

Thanks for the response,

Please see below for the static IP of the Dialer 1, it is 114.133.141.63   

LOT_10#sh ip int brie
Interface                          IP-Address         OK? Method Status         Protocol
FastEthernet0/0            unassigned          YES NVRAM  up                up      
FastEthernet0/1            unassigned          YES NVRAM  up                up      
FastEthernet0/1.1          172.17.100.254  YES NVRAM  up                 up      
FastEthernet0/1.2          172.27.100.254  YES NVRAM  up                 up      
FastEthernet0/1.3          172.7.100.254    YES NVRAM  up                  up      
FastEthernet0/1.4          172.47.100.254  YES NVRAM  up                  up      
FastEthernet0/1.5          172.57.100.254  YES NVRAM  up                  up      
FastEthernet0/1.6          172.67.100.254  YES NVRAM  up                  up      
Serial0/1/0                      58.139.168.170  YES NVRAM  up                  up      
Virtual-Access1              unassigned         YES unset  up                    up      
Virtual-Access2              unassigned         YES unset  up                    up      
Dialer1                           114.133.141.63  YES IPCP   up                    up 

[Tagir Temirgaliyev]

only provider knows is it static or dynamic ip address 114.133.141.63

and they can do it static

after that they can use it as bgp neidbor

[Mohd Khairul Nizam]

Hi,

yes,it is confirm static address.

so does below config OK? 

How it should know preference primary and secondary?

router bgp 65322
 no synchronization
 bgp log-neighbor-changes
 network 172.7.0.0
 network 172.17.0.0
 network 172.27.0.0
 network 172.47.0.0
 network 172.57.0.0
 network 172.67.0.0
 neighbor 58.139.168.169 remote-as 23736
 neighbor 114.133.141.63 remote-as 23736
 no auto-summary

[Tagir Temirgaliyev]

no. it is not.

this is yours address 114.133.141.63

provider should give you corresponding peering BGP neigbor addres

just like

Serial0/1/0                      58.139.168.170  (your side)

neighbor 58.139.168.169 remote-as 23736  (provider side)

preference primary and secondary can be made by weight from your side and provider side

and dont forget to rate posts

[Mohd Khairul Nizam]

How about the routing?

Should I put routing as below,

ip route 0.0.0.0 0.0.0.0 58.139.168.169 210

ip route 0.0.0.0 0.0.0.0 Dialer 1 230

[Tagir Temirgaliyev]

now you have

ip route 0.0.0.0 0.0.0.0 172.27.17.100

I think you dont need

ip route 0.0.0.0 0.0.0.0 58.139.168.169 210

ip route 0.0.0.0 0.0.0.0 Dialer 1 230

and you will get routes to 172.9.0.0/16 throw BGP (serial or adsl)

copy paste here

sh ip route

sh ip bgp

[Mohd Khairul Nizam]

Ok, no need the route 

ip route 0.0.0.0 0.0.0.0 58.139.168.169 210

ip route 0.0.0.0 0.0.0.0 Dialer 1 230

because route will go through BGP

but because the dialer 1 is ip negotiated, is it possible to configure BGP on using interface dialer?? 

by the way, attached is the log.