troubleshooting Question

IP routing table

Avatar of Dragon0x40
Dragon0x40 asked on
RoutersSwitches / HubsNetwork Architecture
15 Comments3 Solutions554 ViewsLast Modified:
A routing table matches route prefixes and if a match is found determines the next hop ip address.

Sometimes that next hop ip address is an ip address located on the same router?

So in addition to determining a next hop ip address you also need to determine an exit interface on that router?

Even if that exit interface is null0 the bit bucket?

I have encountered where I do a "show ip route x.x.x.x" and it shows me a next hop ip address of y.y.y.y

So I run "show ip route y.y.y.y" and it tells me directly connected via vlan z.

I have not encountered a well written explanation of how to use sh ip route to do what I am explaining above. Maybe it is assumed to be so basic that it does not need any explanation.

Could you have a situation where it takes 3 or 4 lookups in the route table before you can determine an exit interface? For example you have to sequentially look up 3 or 4 addresses before you get a next hop ip address and an exit interface?
Join the community to see this answer!
Join our exclusive community to see this answer & millions of others.
Unlock 3 Answers and 15 Comments.
Join the Community
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 3 Answers and 15 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros