DHCP doesn't work on Community Vlan

[mterlikcisco]

I play with brand new C3750X on 12.2(58) if I remember right.
I set up DHCP pool, private vlan - primary and secondary.
For Primary Vlan I created isolated vlan and community vlan. I associated Primary vlans with (I) and (C) secondary vlans.
Next I set interfaces with Primary Isolated and another interface with Primary Community,
Created SVI with IP address.

The wired think is that DHCP pool is working fine on isolated ports, but does not when I plug hosts in to community vlans. When I set static IPs I can ping from host A to host B in community vlan. I run DHCP debugging and I do not see any records when I test it in the community secondary vlan.
I reset DHCP service, cleared bindings,
I check configuration maybe I am missing something but I at this moment I do not know where to look for. Is there a way I can troubleshoot it.

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[Abzal · Accepted solution]

Hi,

Switch configuration would help.

http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_50_se/configuration/guide/swpvlan.html#wp1038472

Hope it will help.

Best regards,
Abzal

[mterlikcisco]

Thanks, I will check the settings, but from I read in that article I think I missed this part http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_50_se/configuration/guide/swpvlan.html#wp1077199
I associated community Vlan with primary Vlan but not with SVI interface. I just don't remember i did this step.


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[mterlikcisco]

Yep, That was a problem

I tested configuratin and after I add

Vlan10 - Primary VLAN

Vlan101 - secondary Isolated VLAN

Vlan100 - secondary Community VLAN

I has

interface Vlan10
 ip address 10.10.20.1 255.255.255.0
 private-vlan mapping 101

I added

interface Vlan10
 ip address 10.10.20.1 255.255.255.0
 private-vlan mapping 101,100

and it works now.

Thank you Abzal for advice!

[Abzal · Accepted solution]

Hi,

You are welcome. Glad to help.
Please mark hepful posts.


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