IP Routing Labs

Over the last few days I have done the first 6 IP routing labs. I have been taking my time with these labs as while not to complicated, its great to run debugs and watch the behavior of different protocols.

Tonight I did my first lab where I learned about the IP SLA Feature. The task has Router 4 connected to Router 1 Loopback via a FastEthernet interface VLAN146, and Frame-relay connection. R4 has 2 static routes, one out FastE VLAN 146 with the default admin static route distance of 1, and a route to R1 Loopback via Frame-relay with admin distance of 2. The goal is to ensure IP reachability to the R1 Loopback if the Fastethernet route to R1 goes down. I created IP SLA echo to send echo request every 5 seconds, and then a enhanced tracking object to track that SLA. I then configured the static ip route with the Tracing Object. Configuration below, followed by the testing. *****NOTE I enabled debug ip routing so we could see the route automatically being added or deleted depending on if R1's ethernet interface was up. Also note, not many pings missed, Im sure if I lowered the IP SLA timer to send pings ever Second instead of every 5 seconds I can limit the packet loss even more.


ip sla 1
icmp-echo 155.3.146.1
frequency 5
ip sla schedule 1 life forever start-time now
!
!track 1 ip sla 1 reachability

ip route 150.3.1.0 255.255.255.0 FastEthernet0/1 track 1



Below is the test!

Rack3R1(config-if)#shut
Rack3R1(config-if)#
CCIE-Console>4
[Resuming connection 4 to R4 ... ]
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%TRACKING-5-STATE: 1 ip sla 1 reachability Up->Down
RT: del 150.3.1.0/24 via 0.0.0.0, static metric [1/0]
RT: delete subnet route to 150.3.1.0/24
RT: NET-RED 150.3.1.0/24
RT: add 150.3.1.0/24 via 155.3.0.1, static metric [2/0]
RT: NET-RED 150.3.1.0/24.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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CCIE-Console>1
[Resuming connection 1 to R1 ... ]

*Mar 2 03:01:56.027: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down
*Mar 2 03:01:57.027: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down
Rack3R1(config-if)#
Rack3R1(config-if)#no shut
Rack3R1(config-if)#
CCIE-Console>4
[Resuming connection 4 to R4 ... ]
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%TRACKING-5-STATE: 1 ip sla 1 reachability Down->Up!!!!!!
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RT: closer admin distance for 150.3.1.0, flushing 1 routes
RT: add 150.3.1.0/24 via 0.0.0.0, static metric [1/0]
RT: NET-RED 150.3.1.0/24!!!!
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Success rate is 99 percent (5651/5659), round-trip min/avg/max = 1/8/144 ms