07-01-2009 09:45 AM - edited 03-04-2019 05:17 AM
I am sitting on switch A-
I can see switch B with a
show cdp neigh
Device ID: Switch
Entry address(es):
IP address: 172.20.111.202
Interface: GigabitEthernet2/0/18, Port ID (outgoing port): GigabitEthernet2/0/
3
I have trunking enabled to allow all vlans
Port Vlans allowed on trunk
Gi1/0/18 1-4094
Gi1/0/50 110-111
Gi1/0/51 151-152
Gi1/0/52 151-152
Gi2/0/18 1-4094
Gi2/0/50 110-111
Gi2/0/51 151-152
Gi2/0/52 151-152
Port Vlans allowed and active in management domain
Gi1/0/18 1,50,110-111,150-153
Gi1/0/50 110-111
Port Vlans allowed and active in management domain
Gi1/0/51 151-152
Gi1/0/52 151-152
Gi2/0/18 1,50,110-111,150-153
Gi2/0/50 110-111
Gi2/0/51 151-152
Gi2/0/52 151-152
and have configured a vlan 111 with an IP address..here is some of the config of switch B
Building configuration...
subnet-zero !
!
!
!
!
!
!
interface FastEthernet0
no ip address
shutdown
!
!
interface GigabitEthernet1/0/21
!
interface GigabitEthernet1/0/22
!
interface GigabitEthernet1/0/23
!
interface GigabitEthernet1/0/24
!
interface GigabitEthernet1/0/25
!
interface GigabitEthernet1/0/26
!
interface TenGigabitEthernet1/0/1
!
interface TenGigabitEthernet1/0/2
!
111
spanning-tree portfast
!
interface GigabitEthernet2/0/19
switchport access vlan 111
!
interface GigabitEthernet2/0/20
!
interface GigabitEthernet2/0/21
!
interface GigabitEthernet2/0/22
!
interface GigabitEthernet2/0/23------------
switchport mode trunk
!
interface GigabitEthernet2/0/24
!
interface GigabitEthernet2/0/25
switchport access vlan 811
!
interface GigabitEthernet2/0/26
switchport access vlan 111
!
interface TenGigabitEthernet2/0/1
!
interface TenGigabitEthernet2/0/2
!
interface Vlan1
no ip address
shutdown
!
interface Vlan111---------------------------
ip address 172.20.111.202 255.255.255.0 !
interface Vlan811
ip address 192.168.100.10 255.255.255.0 !
ip classless
ip http server
!
!
control-plane
!
!
But i cannot ping or telnet from switch A which is directly connected to switch B
via trunk
Solved! Go to Solution.
07-01-2009 11:32 AM
Richard
Just to follow up on last post.
You can either
1) have vlan 111 interface on 3120 and use default-gateway of CSS IP address in 172.20.111.x subnet
or
2) have vlan 110 interface on 3120 and use default-gateway of CSS IP address in 172.20.110.x subnet.
Jon
07-01-2009 09:52 AM
Richard
Need some more info -
1) what type of switches are these ?
2) Can you post "sh ip int brief" from both switches
3) do you have a L3 vlan interface for 111 on switch A ?
Jon
07-01-2009 10:14 AM
switch A is a stacked 3750
switch B are stacked 3120's (hp blade enclosure)
My guy in the field just told me
he could ping 172.20.111.1 from
switch B!?!?!
here is the sh ip int brief from switch A
with ip's
switch A#sh ip int br
Interface IP-Address OK? Method Status Protocol
Vlan1 unassigned YES NVRAM up up
Vlan110 172.20.110.4 YES NVRAM up up
Vlan111 unassigned YES manual up up
Im working on getting it for b
07-01-2009 10:21 AM
Richard
Vlan111 unassigned YES manual up up
You don't have an IP address assigned to vlan 111 interface on switch A. Assign an IP address out of the 172.20.111.x subnet and set this to be the default-gateway on the 3120. So
3750
int vlan 111
ip address 172.20.111.x where x is a free IP address out of that subnet
3120
ip default-gateway 172.20.111.x where x is the IP address on 3750.
Jon
07-01-2009 09:52 AM
Whats weird is that I can Ping a server
that is sitting on the switch itself
but can not ping a vlain int on the switch
Ping to server
SWITCH A#ping 172.20.111.100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.20.111.100, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
Ping to switch B
Switch A#ping 172.20.111.202
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.20.111.202, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
07-01-2009 09:54 AM
Richard
Can you post info asked for and in addition can you post a "sh ip route" from both switches.
Jon
07-01-2009 10:16 AM
switch A # sh ip route
Default gateway is 172.20.110.1
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
Ill ask for the default IP route to switch B
But i dont recall configuring one..
I was under the impression the default routes are not alway necessary on switches
switch A is a stacked 3750
switch B are stacked 3120's (hp blade enclosure)
My guy in the field just told me
he could ping 172.20.111.1 from
switch B!?!?!
here is the sh ip int brief from switch A
with ip's
switch A#sh ip int br
Interface IP-Address OK? Method Status Protocol
Vlan1 unassigned YES NVRAM up up
Vlan110 172.20.110.4 YES NVRAM up up
Vlan111 unassigned YES manual up up
Im working on getting it for b
07-01-2009 10:26 AM
Richard
Ignore previous post.
What is 172.20.111.1 ?
Is the 3750 meant to be a L2 switch only ?
If so you will need to give the 3120 a L3 vlan interface in vlan 110 and not vlan 111.
Can you confirm what is the 3750 meant to be doing and where is the inter-vlan routing happening.
Jon
07-01-2009 10:32 AM
111.1 is actually the gateway we are using for the server.
It is actually a CSS load balancer
I do believe the 3750 is only to be acting as a L2 device.
All it has are servers hanging off of it.
This is the first switch we are connecting to one of its interfaces
07-01-2009 10:38 AM
Richard
If the 3750 is only L2 then you will need to give the 3120 a L3 vlan inteface in vlan 110. This doesn't mean you can't have ports and servers in vlan 111, on a L2 switch the L3 vlan interface is only used to manage the switch.
Jon
07-01-2009 10:53 AM
hmm...we have the server which is assigned to vlan 111 with the ip 172.20.111.100
The server itself is accessible and pingable
07-01-2009 10:55 AM
Richard
Okay then if you can ping 172.20.111.100 from the 3750 then what have you set the default-gateway to on the 3120 ?
And what is the default-gateway for the server 172.20.111.100 ?
Jon
07-01-2009 11:22 AM
Hi Jon
the default gw.for the server is 172.20.111.1
I can ping the server from the default GW
(the css load balancer)
Well it looks like i did have to assign
a vlan 110 ip interface to gain access
to the switch.
Whats weird now..is that i can ping
111.100 from Switch A
But i can not ping it from switch B...and
this is where its connected
will this be resolved if i assigned a default gw to the 3120?
I havent assigned one yet.
07-01-2009 11:29 AM
Richard
You need a default-gateway on switch B to ping anything outside of the subnet assigned to switch B's vlan interface.
So if you want to ping 172.20.111.100 from switch B and switch B is in the 172.20.110.x subnet then yes you will need to add a default-gateway to the 3120.
Jon
07-01-2009 11:29 AM
OK..
so i assigned the default gateway of the switch to the same as the server
172.20.111.1
unpingable from switch B
I changed the default gateway to the same
as switch A
172.20.110.1
and the server is pingable from switch B
Just seems odd that the server works fine
with a default gw that doesnt work on switch B..a switch it is directly connected to
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