Is this a good network configuration?

[wasaqat]

I am trying to configure ip sla for non directed link . I have configured static route to reach to non directed link

1 configured track
2 configured ip sla
3 configured access-list
4 configured NAT
5 configured Event Manager (eem)

 

to make reachability

  ip route 1.1.1.0 255.255.255.252 Serial4/1 //to reachable the ip sla ping to 1.1.1.0

ip sla configuration

  track 88 ip sla 44 reachability
  ip sla 44
  icmp-echo 1.1.1.1
  frequency 5
  ip sla schedule 44 life forever start-time now

track configuration

  track 88 ip sla 44 reachability
  ip route 0.0.0.0 0.0.0.0 10.0.0.2 track 88
  ip route 0.0.0.0 0.0.0.0 20.0.0.2 10

access-list configuration olehana spain

  access-list 100 permit ip 192.168.8.0 0.0.0.255 any

event manager configuration

      event manager applet abc
      event track 88 state up
      action 1   cli command "enable"
      action 1.1 cli command " clear ip nat translation * "
      action 2   cli command "config t"
      action 3   cli command " no ip nat insid source list 100 int 4/0 over"
      action 4   cli command "ip nat inside source list 100 int s4/1 over"
      action 5   syslog msg "track up"

     event manager applet abcd
     event track 88 state down
     action 1   cli command "enable"
     action 1.1 cli command " clear ip nat translation * "
     action 2   cli command "config t"
     action 3   cli command "no ip nat inside source list 100 int s4/1 over"
     action 4   cli command "ip nat inside source list 100 int s4/0 over"
     action 5   syslog msg "track down"

please suggest me about this configuration it work perfect but I little bit confused about it that will it be go longer.or you can suggest me the better way thanks.

[Georg Pauwen · Accepted solution]

Hello,

looks by the book to me, very nice design actually. I don't see anything that needs to be changed, or could be improved...

[Karsten Iwen]

You don't need the EEM to reconfigure the NAT-commands. Here is an example:

https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/100658-ios-nat-load-balancing-2isp.html

[saimonsaeen]

A couple of things:

1. You don't need the eem scripts. You can configure both translations and the packets will be translated correctly depending on which interface is used. olehana russia
2. Depending on the failure scenario, 1.1.1.1 could be reachable via R3-R4. So your SLA will keep flipping up and down.
3. You could also run a routing protocol on the routers which would eliminate the need for IP SLA.