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??
>>Confs router
interface GigabitEthernet0/1
no ip address
!
interface GigabitEthernet0/1.998
description "connected to WAN vlan ID 998 - Cable Modem"
encapsulation dot1Q 998
bridge-group 1
!
interface GigabitEthernet0/1.999
description "connected to WAN vlan ID 999 - ADSL"
encapsulation dot1Q 999
ip address 10.0.0.2 255.255.255.248
!
interface BVI1
ip address dhcp
>>Confs switch
interface FastEthernet0/17
description c2821 outside
switchport trunk allowed vlan 998,999
switchport mode trunk
!
interface FastEthernet0/18
description adsl
switchport access vlan 999
!
interface FastEthernet0/19
description cable
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
Feb 9 03:00:28.685: 306138392D425631
Feb 9 03:00:28.685: Hostname: c2821
Feb 9 03:00:28.685: DHCP: SDiscover: sending 292 byte length DHCP packet
Feb 9 03:00:28.685: DHCP: SDiscover 292 bytes
Feb 9 03:00:28.685: B'cast on BVI1 interface from 0.0.0.0
Feb 9 03:00:31.497: DHCP: Received a BOOTREP pkt Not for us..: xid: 0x23ECA7F
Feb 9 03:00:32.685: DHCP: SDiscover attempt # 3 for entry:
Feb 9 03:00:32.685: Temp IP addr: 0.0.0.0 for peer on Interface: BVI1
Feb 9 03:00:32.685: Temp sub net mask: 0.0.0.0
Feb 9 03:00:32.685: DHCP Lease server: 0.0.0.0, state: 1 Selecting
Feb 9 03:00:32.685: DHCP transaction id: 1798
Feb 9 03:00:32.685: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
Feb 9 03:00:32.685: Next timer fires after: 00:00:04
Feb 9 03:00:32.685: Retry count: 3 Client-ID: cisco-0013.1a7f.0a89-BV1
Feb 9 03:00:32.685: Client-ID hex dump: 636973636F2D303031332E316137662E
Feb 9 03:00:32.685: 306138392D425631
Feb 9 03:00:32.685: Hostname: c2821
Feb 9 03:00:32.685: DHCP: SDiscover: sending 292 byte length DHCP packet
Feb 9 03:00:32.685: DHCP: SDiscover 292 bytes
Feb 9 03:00:32.685: B'cast on BVI1 interface from 0.0.0.0
Feb 9 03:00:36.685: DHCP: QScan: Timed out Selecting state
Feb 9 03:00:43.741: DHCP: Received a BOOTREP pkt Not for us..: xid: 0xA87C56C3
Feb 9 03:00:43.773: DHCP: Received a BOOTREP pkt Not for us..: xid: 0xA87C56C3%Unknown DHCP problem.. No allocation possible
Feb 9 03:00:45.821: DHCP: Waiting for 20 seconds on interface BVI1
Feb 9 03:00:47.381: DHCP: Received a BOOTREP pkt Not for us..: xid: 0xFF724762
Feb 9 03:00:49.737: DHCP: Received a BOOTREP pkt Not for us..: xid: 0x18D646E9
Feb 9 03:01:00.897: DHCP: Received a BOOTREP pkt Not for us..: xid: 0x5583DDD0
