connectivity between svi problem

Unanswered Question
Oct 17th, 2007

Ok I dont know why I am drawing a blank here but for some reason i cant connect between these 2 svi's.


I have 2 layer 3 switches.


Switch 1:

int vlan 100

ip address 172.16.1.133/29


int g1/10

description "trunk to switch2"

switchport trunk encap dot1q

switchport mode trunk

switchport nonegotiate


Switch 2:

int vlan 100

ip address 172.16.1.141/29


int g1/12

description "trunk to switch1"

switchport trunk encap dot1q

switchport mode trunk

switchport nonegotiate



Ok so the trunk forms with no problem but I cannot ping the 172.16.1.133 from switch 2 and cannot ping 172.16.1.141 from switch 1.


I can ping 172.16.1.133 from switch 1, which it is configured on.


I can ping 172.16.1.141 from switch 2, which it is configured on.


What am I missing here?

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Kevin Dorrell Wed, 10/17/2007 - 05:39

These are different subnets.


172.16.1.133/29 is 172.16.1.[128 - 135]


172.16.1.141/29 is 172.16.1.[136 - 143]


Kevin Dorrell

Luxembourg


cisconoobie Wed, 10/17/2007 - 05:44

yes I know this. Anyway I can connect them via the vlan ? Should I remove the trunk?

Edison Ortiz Wed, 10/17/2007 - 05:47

You've configured the same Vlan on both switches (Vlan100) but you've assigned IPs that belong on different subnets.


It's like configuring 2 workstations with IP

172.26.1.10 in one device and 192.168.1.10 in another.


There is no trick or way around it, they must belong to a common subnet.



cisconoobie Wed, 10/17/2007 - 05:54

Thanks for the reply. I am going nuts with this ewan configuration.


I have 2 layer 3 switches connected into the ewan cloud and both of them need the same int vlan 100 with different IP subnets for connectivity like shown here http://www.cisco.com/en/US/netsol/ns341/ns396/ns223/ns227/networking_solutions_white_paper09186a00801e1225.shtml#wp41702


I cant figure out how to link these 2 l3 switches together without going through the cloud.


any advise?

Kevin Dorrell Wed, 10/17/2007 - 06:11

Well, there is a way, if these are layer-3 switches and they are doing IP routing.


On switch 1:


ip route 172.16.1.136 255.255.255.248 vlan1



On switch 2:


ip route 172.16.1.128 255.255.255.248 vlan1



It's a bit messy.


Kevin Dorrell

Luxembourg


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