topic Re: universal workgroup bridge DHCP address in Wireless

universal workgroup bridge DHCP address

Andriy Sidko — Mon, 05 Jul 2021 17:54:39 GMT

Hi guys.

I'm configuring uWGB at cisco 891W. AP module successfully connected to remote AP:

++++++++++++++++++++
ap(config)#do sh dot11 ass all | i State|Connected
State : Assoc Parent : -
Signal Strength : -37 dBm Connected for : 1863 seconds
ap(config)#
++++++++++++++++++++

int bvi 1 configured to get IP from DHCP

++++++++++++++++++++
ap(config-if)#do sh runn int bvi 1
Building configuration...

Current configuration : 89 bytes
!
interface BVI1
mac-address 00ed.b184.2174
ip address dhcp client-id Dot11Radio0
end
++++++++++++++++++++

however IP has not assigned to interface BVI1

++++++++++++++++++++
ap(config-if)#do sh ip int bri | i BVI
BVI1 unassigned YES DHCP up up
ap(config-if)#end
++++++++++++++++++++

same time I've found right IP 192.168.172.50 assigned to client w/ MAC 00ed.b184.2174 (this is ap's BVI1. see above)

++++++++++++++++++++
gate-dhcp#sh ip dhcp bin | i ed
Bindings from all pools not associated with VRF:
192.168.172.50 0100.edb1.8421.74 Aug 25 2019 03:03 AM Automatic
gate-dhcp#
++++++++++++++++++++

Could somebody explain why?

wireless link works correctly because whenever I assigned same IP 192.168.172.50 I got from DHCP server manually at access point interface BVI1

++++++++++++++++++++

ap(config)#do sh runn int bvi1
interface BVI1
mac-address 00ed.b184.2174
ip address 192.168.172.50 255.255.255.248
end
++++++++++++++++++++

I can reach stations behind uWBG (bellow).

++++++++++++++++++++

ap(config)#do pin 192.168.172.197 re 10
Type escape sequence to abort.
Sending 10, 100-byte ICMP Echos to 192.168.172.197, timeout is 2 seconds:
!!!!!!!!!!
Success rate is 100 percent (10/10), round-trip min/avg/max = 1/3/4 ms
ap(config)#
++++++++++++++++++++

complete ap configuration attached.

Thank you in advance.

Re: universal workgroup bridge DHCP address

Andriy Sidko — Mon, 26 Aug 2019 13:58:43 GMT

addition.

wireless network reserved for wireless bridges 192.168.172.48/29

Re: universal workgroup bridge DHCP address

Ric Beeching — Mon, 26 Aug 2019 14:26:10 GMT

Universal WGBs are designed for a single wired client to be provided wireless access so your AP picking up a second IP isn't supported by Cisco. For some reason the setup does allow that static access however..

Thanks,
Ric

Re: universal workgroup bridge DHCP address

Andriy Sidko — Mon, 26 Aug 2019 15:26:26 GMT

Thank you Ric.

I know this rule. Question in this case why access point's module interface BVI1 is not relaying DHCP packets towards to router module interface vlan 1? (router interface vlan 1 in dhcp mode)

++++++++++++

Router#sh ip int brie | i lan1
Vlan1 unassigned YES DHCP up up
Router#

++++++++++++

Link between router and ap modules works. So after assigning same subnet IPs to AP's BVI1 and router VLAN1 I can ping vise versa

AP and router modules updated config attached.

p.s. changes were:
ip address dhcp erased from BVI1 config
interface BVI1
mac-address 00ed.b184.2174
no ip address

as well as default gateway configuration

ip default-gateway 192.168.172.49

Thank you.