We help IT Professionals succeed at work.
Get Started

EIGRP layer2 and layer 3

639 Views
Last Modified: 2012-05-12
If one switch has only layer 2 and the other switch has layer 2 and 3 will the route have to go through the switch with layer 3 connection even though both have direct layer 2 connections?

Two distribution switches 1 and 2 are connected by a trunk that allows all vlans across including vlans 3 and 10.

Switch 1 and 2 each has a seperate trunk connection to a switch 3 that then connects a single leg connection to a router with an ip address of 1.2.3.4 which is in the vlan 3 network.

Switch 1 runs eigrp protocol and when I run show ip route 1.2.3.4 it shows "connected" *directly connected to vlan 3

Switch 2 runs eigrp protocol and when I run show ip route 1.2.3.4 it shows "eigrp 123" *10.10.10.10 from 10.10.10.10 via vlan 10"

On switch 2 when I run show ip route 10.10.10.10 it shows "connected" *directly connected via vlan 3

On switch 2 when I run traceroute 1.2.3.4 I get 1st hop 10.10.10.10 and 2nd hop 1.2.3.4

Switch 2 has a vlan int for vlan 10 but not no vlan int for vlan 3

Switch 1 has a vlan int for both vlan 10 and 3

Is this happening because switch 2 does not have an ip address/interface in vlan 10 and then switch 1 is advertises 1.2.3.4 across vlan 10 to switch 2 even though there is trunk between switch 1 and 2 that allows vlan 10 and 3?

I originally expected to see sh ip route 1.2.3.4 as *directly connected to vlan 3 on both switch 1 and 2?

Both switch 1 and switch 2 have a layer 2 connection to vlan 3 but only switch 1 has a layer 3 connection to vlan 3
Comment
Watch Question
Sr.Net.Eng
CERTIFIED EXPERT
Top Expert 2011
Commented:
This problem has been solved!
Unlock 1 Answer and 4 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE