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New Member

IPSLA based routing using 3750x

this is my config, trying to failover using WAN links between two sites , two c3750x one at each site. connected to Internet via Watcghuard XTM 505 devices and connected to each other for WAN -point to point link, that i want to use for failover.

it does failover but for some reason internet goes dead after every 30 seconds for around 30 seconds then comes on for 30 seconds and goes down after 30 seconds, its like a loop.

not sure what i am missing in config.

 

track 1 ip sla 1 reachability
 delay down 30 up 30
!
track 2 ip sla 2 reachability
 delay down 30 up 30

 

interface GigabitEthernet1/0/23
 switchport access vlan 88
 switchport mode access
!
interface GigabitEthernet1/0/24
 switchport access vlan 999
 switchport mode access

interface Vlan88
 ip address 172.16.100.1 255.255.255.0
!
interface Vlan999
 ip address 172.16.10.1 255.255.255.0

ip route 10.0.0.0 255.255.255.0 172.16.100.2 track 2
ip route 0.0.0.0 0.0.0.0 172.16.10.10 track 1

ip route 10.0.0.0 255.255.255.0 172.16.10.10 10
ip route 0.0.0.0 0.0.0.0 172.16.100.2 10

 

 

9 REPLIES
New Member

attached is network overview

attached is network overview diagram,  i didn't include all subnets in above config.

 

New Member

sorry missed actual sla

sorry missed actual sla commands.

 

 

ip sla 1
 icmp-echo 8.8.8.8
 frequency 10
ip sla schedule 1 life forever start-time now


ip sla 2
 icmp-echo 172.16.100.1
 frequency 10
ip sla schedule 2 life forever start-time now

 

New Member

You need to put on ip sla 1

You need to put on ip sla 1 ip address 172.16.10.10. And for ip sla 2 ip address 172.16.100.2. You got in to loop because you track 8.8.8.8 that become alive on the other route. Yaron.
New Member

Hi Yashtoni attached current

Hi Yashton

i attached current config for both cisco switches.

you mean use like this

ip sla 1 ip address 172.16.10.10
 icmp-echo 8.8.8.8
 frequency 10
ip sla schedule 1 life forever start-time now

 

ip sla 2 ip address 172.16.100.2
 icmp-echo 172.16.100.1
 frequency 10
ip sla schedule 2 life forever start-time now

 

New Member

Hi,Your sla should look like

Hi,

Your sla should look like this:

ip sla 1
 icmp-echo 172.16.10.10
 frequency 10
ip sla schedule 1 life forever start-time now

 


ip sla 2
 icmp-echo 172.16.100.2
 frequency 10
ip sla schedule 2 life forever start-time now

 

 

New Member

Hiif we pinging 172.16.10.10

Hi

if we pinging 172.16.10.10  that is my router IP , that will never go offiline . but instead internet itself can go down beyond router thats why we should ping external IP .

i think i need to define which route to be used for pinging 8.8.8.8 

may be a static route than to tell it go out only via bham site router, for ipsla ping only.

not sure if we can tell ip sla command to use a specific gateway to ping . may be use specific interface only. that is connected to firewall.

 

 

 

New Member

hi,if you ping 8.8.8.8 with

hi,

if you ping 8.8.8.8 with source ip 172.16.10.1 while the line is down, you get replay?

if not you should configure the ip sla 1 with source ip address.

or try to track the line ip addrees (over the XTM).

Highlighted
New Member

i need to test that,what if I

i need to test that,

what if I define IP address on Interfaces for router uplink and point to point lines, instead of using VLANs for these two links. and not sure if can define interface to use in ipsla command. somehow need to restrict ipsla icmp to go out only via one route.

 

New Member

goolged around not sure if

goolged around not sure if below is correct format. e.g. at site BHAM to ping 8.8.8.8 via firewall at BHAM only which have IP 172.16.10.10

ip sla 1
 icmp-echo 8.8.8.8 source-ip 172.16.10.10
 frequency 10
 
ip sla schedule 1 life forever start-time now

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