06-16-2008 12:40 AM - edited 03-05-2019 11:38 PM
Hi,
When i enable ip routing on my cisco 3750. it becomes unreachable. I created l2 and l3 vlans with ip addresses
any idea?
J
06-16-2008 12:49 AM
Jorg
Perhaps you could post the config.
First thing to check is your routing. Does your 3750 know how to route back to the source IP addresses you are coming from.
Please supply some more details in terms of IP addressing, topology etc.
Jon
06-16-2008 01:28 AM
Hi Jon
here is my config. I'm changing the config for a migration plan. Port config is already in place. All ports are configured in vlan 10 at this moment. I needed to deleted the port config to minimize output for this post.
The topolpgy is as follows. 1 switch 3750 as the core, 1 2950 and another connected to the 2950. the uplinks are trunk ports.
!
hostname aaa-bb250003
!
enable secret 5
enable password 7
!
no aaa new-model
switch 1 provision ws-c3750-24ts
ip subnet-zero
ip name-server 10.xx.1.3
!
errdisable recovery cause bpduguard
errdisable recovery cause link-flap
errdisable recovery interval 120
no file verify auto
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface FastEthernet1/0/2
description Naar werkstation
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!
!
interface GigabitEthernet1/0/1
description Naar ws-c2950 in MER
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Vlan1
no ip address
no ip route-cache
shutdown
!
interface Vlan10
ip address 10.xx.250.3 255.255.255.0
no ip route-cache
!
interface Vlan12
description Datacenter
ip address 10.xx.1.253 255.255.255.0
ip helper-address 10.xx.1.34
ip helper-address 10.yy.1.34
!
interface Vlan22
description Officevlan
ip address 10.xx.10.254 255.255.255.0
ip helper-address 10.yy.1.34
ip helper-address 10.xx.1.34
!
interface Vlan32
description VoIP
ip address 10.xx.30.254 255.255.255.0
ip helper-address 10.xx.1.34
ip helper-address 10.yy.1.34
!
interface Vlan42
description ILODRAC
ip address 10.xx.40.254 255.255.255.0
!
interface Vlan72
description studentenvlanA
ip address 10.xx.71.254 255.255.252.0
ip helper-address 10.xx.1.34
ip helper-address 10.yy.1.34
!
interface Vlan902
description Network Management
no ip address
!
ip default-gateway 10.xx.1.41
ip classless
ip http server
ip http secure-server
!
logging trap warnings
logging facility local6
!
control-plane
!
!
line con 0
exec-timeout 0 0
line vty 0 4
password 7
login
line vty 5 15
password 7
login
!
end
best regards
06-16-2008 01:56 AM
Hi,
When you enable ip routing on L3 switch, this becomes L3 switch. on L3 switches you don't use Ip default gateway. You should remove this with
no ip default-gateway 10.xx.1.41
instead you will need to define
ip route 0.0.0.0 0.0.0.0 10.xx.1.41
and also if you are shutting down Vlan1 then you should define native valn on your trunk links. On the ports connecting to C2950.
for example
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk native vlan 10
HTH
Shaheen
06-16-2008 03:40 AM
Shahem is correct , remove the default gateway and change it to a default static route pointing to the same address.
06-16-2008 05:45 AM
Hi,
I think i found it. I'm connecting through the site via an other site. The management address of the other switch is incorrect. So because i enabled routing and native vlan is not configured the route to management interface of the L3 switch wasn't reachable.
tommorow i'm on the site to enable routing and let you know. Anyway thanks for the support.
Best regards
J.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: