So I was pinging and tracing around during my lab when
I noticed I had a routing loop.
Not sure what was casuing the loop but I managed to
fix it somehow.
Can't remember how I did it,but during all the
troubleshooting I took a closer look at how things
were behaving
After nosing around I noticed that on R5 depending on
the order of which interface came up first you would
see different behaviors.
For example
Once there was no routing loop and everything was
fixed I noticed that if on R5 I shut down the s0/1/0
interface routes to 151.11.7.0/24 and 151.11.77.0/24
would fall back to the external eigrp learned route.
And this is what we want would here !!
Ospf is 110 and then 170 would be lurking in the
background incase the 110 was lost.
So that all worked great.
But if you brought that s0/1/0 back up on R5 the route
would not change back to the OSPF learned route!
I looked at the OSPF database and it showed:
R5# sh ip os data
output cutout
Type-5 AS External Link States
Link ID ADV Router Age Seq#
Checksum Tag
10.0.0.0 151.11.5.5 383 0x80000001
0x00F376 0
151.11.1.0 151.11.5.5 483 0x80000001
0x00349C 0
151.11.2.0 151.11.5.5 483 0x80000001
0x0029A6 0
151.11.5.0 151.11.5.5 18 0x80000002
0x0006C5 0
151.11.7.0 151.11.5.5 383 0x80000001
0x00F1D8 0
151.11.12.0 151.11.5.5 483 0x80000001
0x00BA0B 0
151.11.15.0 151.11.5.5 519 0x80000001
0x009929 0
151.11.77.0 151.11.5.5 383 0x80000001
0x00EC97 0
Why does the router think that it is orignating the
routes to those two networks??
Shouldn't it realize now that the s0/1/0 is backup
that it should fallback to hearing the route from
151.11.8.8?
I had to clear the ip ospf redistribution to get it
back to normal:
from r5 sh ip ospf database:
Type-5 AS External Link States
Link ID ADV Router Age Seq#
Checksum Tag
10.0.0.0 151.11.8.8 497 0x80000001
0x00BB50 0
151.11.1.0 151.11.2.2 528 0x80000002
0x00597C 0
151.11.1.0 151.11.5.5 497 0x80000001
0x00349C 0
151.11.2.0 151.11.2.2 528 0x80000008
0x00428C 0
151.11.2.0 151.11.5.5 497 0x80000001
0x0029A6 0
151.11.5.0 151.11.2.2 1068 0x80000001
0x002FA3 0
151.11.5.0 151.11.5.5 497 0x80000001
0x0008C4 0
151.11.7.0 151.11.8.8 498 0x80000001
0x00B9B2 0
151.11.8.0 151.11.8.8 1542 0x80000008
0x00A0C3 0
151.11.12.0 151.11.2.2 529 0x80000008
0x00D3F0 0
151.11.12.0 151.11.5.5 498 0x80000001
0x00BA0B 0
151.11.15.0 151.11.2.2 530 0x80000002
0x00BE09 0
151.11.15.0 151.11.5.5 499 0x80000001
0x009929 0
151.11.77.0 151.11.8.8 499 0x80000001
0x00B471 0
151.11.78.0 151.11.8.8 1543 0x80000008
0x009B82 0
my config is pretty much the same as the PG except
that i marked eigrp routes redistributed into ospf as
metric-type 1
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