Layer 3 Ether-channel Dual Up link

[qasimkhans8]

Hi,

     i have setup layer 3 switch with need to have Ether-channel Dual Up links. please see the attached network diagram. my goal is if Router 1 goes down then all traffic go through Router 2 and PC1 can communicate with PC3. i entered default routes of both routers

ip route 0.0.0.0 0.0.0.0 10.1.1.1
ip route 0.0.0.0 0.0.0.0 10.2.2.1

if i use single route of Router1 then PC1 can communicate PC2, when i enter default routes of both routers, then PC1 cannot communicate with PC2 and PC3. how can i fix it?  Thanks,

following is my Layer 3 Switch config.

Current configuration : 2157 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
ip routing
!
spanning-tree mode pvst
!
interface Port-channel 1
description Link to R1
no switchport
ip address 10.1.1.2 255.255.255.252
!
interface Port-channel 2
description Link to R2
no switchport
ip address 10.2.2.2 255.255.255.252
!
interface FastEthernet0/1
switchport access vlan 30
switchport mode access
spanning-tree portfast
!
!

!
interface FastEthernet0/21
no switchport
channel-group 2 mode on
no ip address
duplex auto
speed auto
!
interface FastEthernet0/22
no switchport
channel-group 2 mode on
no ip address
duplex auto
speed auto
!
interface FastEthernet0/23
no switchport
channel-group 1 mode on
no ip address
duplex auto
speed auto
!
interface FastEthernet0/24
no switchport
channel-group 1 mode on
no ip address
duplex auto
speed auto
!
!

interface Vlan1
no ip address
shutdown
!
interface Vlan30
ip address 192.168.30.1 255.255.255.0
!
interface Vlan31
ip address 192.168.31.1 255.255.255.0
!
interface Vlan32
ip address 192.168.32.1 255.255.255.0
!
interface Vlan33
ip address 192.168.33.1 255.255.255.0
!
interface Vlan34
ip address 192.168.34.1 255.255.255.0
!
interface Vlan35
ip address 192.168.35.1 255.255.255.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.1.1.1
ip route 0.0.0.0 0.0.0.0 10.2.2.1

[Philip D'Ath]

Enter routes for both remote subnets.

ip route 172.16.1.0 255.255.255.0 10.2.2.1
ip route 110.90.120.0 255.255.255.0 10.1.1.1.

[qasimkhans8]

Thanks, but what to do if we want to route traffic on internet. like i have to use default route. like....

ip route 0.0.0.0 0.0.0.0 10.1.1.1
ip route 0.0.0.0 0.0.0.0 10.2.2.1

[Philip D'Ath]

There is not enough information to comment on routing to the Internet.  The routes I have given will fix your issue regardless of the two above default routes.

[qasimkhans8]

please see the attached image of network, there is 1 layer 3 switch which is connected to 2 routers and both routers are connected to internet. 

all in and out traffic is going through R1, if R1 goes down then all in and out traffic go through R2.

[Philip D'Ath]

You would need to use a different administrative distance like this:

ip route 0.0.0.0 0.0.0.0 10.1.1.1 
ip route 0.0.0.0 0.0.0.0 10.2.2.1 10

However this will only failover if the whole connection to the router is lost.

[qasimkhans8]

this does not work, i switched off R1 but traffic does not goes through R2. when i run sh ip route there is no route for R2

ip route 0.0.0.0 0.0.0.0 10.1.1.1

ip route 0.0.0.0 0.0.0.0 10.2.2.1 10

sh ip route

Codes: C - connected, S - static, I - IGRP, 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, E - EGP

i - IS-IS, 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 10.1.1.1 to network 0.0.0.0

10.0.0.0/30 is subnetted, 2 subnets

C 10.1.1.0 is directly connected, Port-channel 1

C 10.2.2.0 is directly connected, Port-channel 2

C 192.168.30.0/24 is directly connected, Vlan30

S* 0.0.0.0/0 [1/0] via 10.1.1.1