02-13-2006 03:47 PM
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.
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.
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
02-13-2006 05:08 PM
Can you confirm that you have the following configured:
bridge 1 protocol ieee
bridge 1 route ip
Paresh
02-14-2006 05:35 AM
Yes, I have configured "bridge 1 protocol ieee", "bridge 1 route ip" and "bridge irb".
02-15-2006 05:02 AM
The Cable Service Provider is receiving the mac-address of interface fast
ethernet 0/19 of switch. Are there how the switch doesn´t send this information
and the SP receive de mac-address of router?
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