I have a router 2821 with two Internet links over "one" ethernet port. For this, I configured the interface GigabitEthernet0/1 in two subinterfaces with Vlans (interface GigabitEthernet0/1.998 and interface GigabitEthernet0/1.999). Betwen the router and the internet modens (ADSL and Cable) I have a Catalyst 2950T with the respective Vlans.
My problem is with the interface GigabitEthernet0/1.998 that is connected to cable modem (Motorola). This interface doesn´t receive IP address in the BVI interface via DHCP. If I place a workstation or the interface GigabitEthernet0/1 without Vlan configuration and switch the IP address is ok.
It has some suggestion, the problem is with the BVI interface or with the switch configuration (mac-address switch x mac-address router for the service provider)? What is the good design for this??
no ip address
description "connected to WAN vlan ID 998 - Cable Modem"
encapsulation dot1Q 998
description "connected to WAN vlan ID 999 - ADSL"
encapsulation dot1Q 999
ip address 10.0.0.2 255.255.255.248
ip address dhcp
description c2821 outside
switchport trunk allowed vlan 998,999
switchport mode trunk
switchport access vlan 999
switchport access vlan 998
Feb 9 03:00:28.685: Retry count: 2 Client-ID: cisco-0013.1a7f.0a89-BV1
Feb 9 03:00:28.685: Client-ID hex dump: 636973636F2D303031332E316137662E
Bridging configuration because with the 'ip address dhcp' under interface GigabitEthernet0/1.998 doesn´t receive the ip address with the cable modem. If I place other dhcp server (Linux) with this configuration in the interface GigabitEthernet0/1.998 the IP address is ok. Bridging because cable modem.
With the BVI configuration, the dhcp client on the interface already received the IP, but after one or two days trying. In this midle time, the service provider doesn´t have allocated none IP and mac-address.
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