Question about Cisco mls intervlan routing

[from88]

Just wanted to ask, how to generate the following output:

switch#

show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF,

IA - OSPF inter area

N1 - OSPF NSSA external type 1,

N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1,

L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default,

U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 13 subnets, 2 masks

D 10.1.3.0/24 [90/28416] via 10.1.10.10, 08:09:49, Vlan10

D 10.1.2.0/24 [90/28416] via 10.1.10.10, 08:09:49, Vlan10

C 10.1.10.0/24 is directly connected, Vlan10

How it's possible to generate this output. I don't get (bolded) how the EIGRP learned routes can be attached to the Vlan10 ? I think that it should be interface or port-channel ? so How it can be configured ? Thanks !

[Marwan ALshawi · Accepted solution]

this siwtch configured as L3 switch with EIGRP

the route 10.1.3.0/24 is know from next hop with IP 10.1.10.10 this could be another L3 switch or a router and this 10.1.10.10 is connected or reachable via local interface vlan 10 ( L3 interface in the switch )

if you do show ip int bri you will see interface vlan 10 with IP

HTH

if helpful Rate

[from88]

so this switch, where output is generated, have a vlan with 10.1.10.0/24 prefix and eigrp is configured. But the other (for example L3 switch) how needs to be configured ? It too should have be configured with Vlan10 ? But what ip it should have ? How that other switch should have be configured ? can you make a short configuration for example to generate that output ? Thanks

Oh i think i get it, it's very simple:

S1

vlan 10 with ip addr: 10.1.10.1/24

ant eigrp enabled

S2

vlan 10 with ip add:10.1.10.2/24

with other interfaces as seen in route table with eigrp enabled,

Also trunk link enabled between switches.

gonna try it at home.

[Marwan ALshawi]

ya you right and as Edison mentioned

the L2 Vlans are just to form the L2 vlan path

while L3 vlan will use this L2 path to form the end to end reachability

for example

Switch1--Vlan10/L3----Trunk/withvlan10------Switch2/trunk pass vlan 10----vlan10/L3

this way valn10 interfaces on both siwtches will looks like directly connected from L3 point of view

HTH

[Edison Ortiz]

If the next-hop is learned via Vlan10, then it will show as such on the output. It seems your port-channel is Layer2 and it carries Vlan10. Vlan10 has the IP address that formed the adjacency. If you want the Port-Channel to show instead, you must configure L3 Port-Channel and perform the EIGRP adjacency from there.

Regards,

Edison