ā03-16-2023 10:05 PM
Hello, I cannot get my switch and router to communicate. I am using OSPF and I can get Router 1 to communicate with Router 2 but I cannot get the Switch to communicate.
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ā03-17-2023
09:46 AM
- last edited on
ā03-20-2023
02:39 AM
by
Translator
R2 looks like it has
/30 interface Gig0/1
that's ready to have a connection to S1, but S1's physical ports are configured as layer 2 trunks. Loopback1 on SW1 has an ip, but that's a "virtual interface". I don't typically see them configured as
/30s
and definitely not as
ospf point-to-point
but maybe someone can elaborate on a use case for that.
SW1 needs a layer 3 connection to R2, maybe in the
10.0.3.0/30 network
Mirror the
Gig0/1 R2 configs (with 10.0.3.2)
on whatever port SW1 will use to connect to R2.
ā03-17-2023 02:12 AM
Hello
Your switch has no ip connectivity to the rtrs?
ā03-17-2023
09:46 AM
- last edited on
ā03-20-2023
02:39 AM
by
Translator
R2 looks like it has
/30 interface Gig0/1
that's ready to have a connection to S1, but S1's physical ports are configured as layer 2 trunks. Loopback1 on SW1 has an ip, but that's a "virtual interface". I don't typically see them configured as
/30s
and definitely not as
ospf point-to-point
but maybe someone can elaborate on a use case for that.
SW1 needs a layer 3 connection to R2, maybe in the
10.0.3.0/30 network
Mirror the
Gig0/1 R2 configs (with 10.0.3.2)
on whatever port SW1 will use to connect to R2.
ā03-17-2023
09:56 AM
- last edited on
ā03-20-2023
02:41 AM
by
Translator
you are not run
ip routing
in SW ?? may be this issue here
ā03-18-2023 10:52 PM
I agree with @MHM Cisco World that we do not see ip routing enabled on the switch, although there are multiple commands in the config that would only be valid if ip routing were enabled. So that might be part of the issue. I agree with @BruteForce that the loopback interface on the switch is odd and not functional. It has an IP and ospf statements like it expected to run ospf. But the loopback does not have any physical connectivity and so running ospf on it does not make sense.
The basic problem here is that both routers have G0/0 with interfaces in a /30 subnet. They obviously are connected to switch ports in vlan 1 and can communicate with each other. But the switch does not have an IP address in vlan 1 (and there is not room in the subnet for a third device). So the switch is not able to communicate IP with either router.
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