02-02-2009 02:19 AM - edited 03-06-2019 03:48 AM
Hi guys,
There has been a need in our business to create a seperate VLAN for development work.
The vlan is vlan 20.
We have two Layer 3 switches doing onter-vlan routing.
We have a DHCP server on 192.168.2.1 and 192.168.2.2
I have defined the VLAN 20 on the L3 switches as 192.168.20.2 and 192.168.20.2 (HSRP) with the virtual gateway of 192.168.20.1 as the gateway for the clients.
I have also defined the IP helper on the vlans ip helper-address 192.168.2.1 and 192.168.2.2
I have used VTP to push this out to the remaining switches and this has worked.
However when I place a PC in this VLAN it is unable to contact the DHCP server for an address.
I have a W2K-2003 server as the DHCP server, have defined the scope, etc.
What am I missing? Thanks
02-02-2009 02:55 AM
Hi
I have defined the VLAN 20 on the L3 switches as 192.168.20.2 and 192.168.20.2 (HSRP) with the virtual gateway of 192.168.20.1 as the gateway for the clients.
Can u confrim the other IP address in the HSRP group is it the same on both the switches..?
Can u verify weather spanning-tree portfast in configured under the vlan SVI.
Thanks
Mahmood
02-02-2009 03:05 AM
Hi Mahmood
On switch 2 the standby ip is 192.168.20.1 and it is the same on switch 3
On switch 2 the VLAN 20 IP address is 192.168.20.2 and on switch 3 the ip address is 192.168.20.3
One thing I have noticed is when I execute the sh standby on the switches both are showing as active?? Maybe this is causing the problem? I also cannot ping 192.168.20.2... the configs are exactly the same as they are for two other VLANs that are working?
02-02-2009 03:47 AM
Hi,
Here is my HSRP config for the VLAN followed by its current state on both switches
SW003
=========================================
interface Vlan20
description EXTERNAL CONTRACTOR vlan
ip address 192.168.20.3 255.255.255.0
standby 1 ip 192.168.20.1
standby 1 priority 105
standby 1 preempt delay minimum 60
end
SW002
=========================================
interface Vlan20
description EXTERNAL CONTRACTOR vlan
ip address 192.168.20.2 255.255.255.0
standby 1 ip 192.168.20.1
standby 1 preempt
end
HSRP STATUS SW003
=========================================
Vlan20 - Group 1
State is Active
14 state changes, last state change 00:05:47
Virtual IP address is 192.168.20.1
Active virtual MAC address is 0000.0c07.ac01
Local virtual MAC address is 0000.0c07.ac01 (v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 0.861 secs
Preemption enabled, delay min 60 secs
Active router is local
Standby router is unknown
Priority 105 (configured 105)
IP redundancy name is "hsrp-Vl20-1" (default)
SW002
=========================================
SW002#SH STANDby
Vlan20 - Group 1
State is Active
5 state changes, last state change 00:06:00
Virtual IP address is 192.168.20.1
Active virtual MAC address is 0000.0c07.ac01
Local virtual MAC address is 0000.0c07.ac01 (v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 0.165 secs
Preemption enabled
Active router is local
Standby router is unknown
Priority 100 (default 100)
IP redundancy name is "hsrp-Vl20-1" (default)
Thanks for any help
Darren
02-02-2009 04:01 AM
Hi
It seems the switches are not able to exchange the hello packets.
Look in to cabling issues or u have a STP blocked port .
Thanks
Mahmood
02-02-2009 04:05 AM
Hi Mahmood,
It is very odd as other vlans with the same configuration on both switches are working? How do you diagnose a blocked port in a VLAN???
Thanks Darren
02-02-2009 04:07 AM
Also Mahmood I found this..
Not sure why this is the VLAN20 state
SW003#sh ip int br
Interface IP-Address OK? Method Status Protocol
Vlan1 192.168.2.251 YES NVRAM up up
Vlan20 192.168.20.3 YES manual up up
Vlan40 192.168.40.3 YES NVRAM up up
Vlan60 192.168.60.3 YES NVRAM administratively down down
Vlan70 192.168.70.3 YES NVRAM up up
02-02-2009 04:14 AM
HI
Can u post the sh ip int bri from SW4 and sh vlan.
Thanks
Mahmood
02-02-2009 04:19 AM
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