I am trying to get an untagged interface GIG0/0 to bridge to VLAN10 which is only connected to VMWare on the SRE. I have successfully done this when I use EHWIC-D8ESGP and sometime it works without that card. My problem is that you can not tell if it is going to work and wether VLAN 10 will actualy come up and if vlan 10 will be trunked to SM1/1. Sometimes when I activate the Bridge IRB and the BVI10 interface the router becomes sluggish when entering config t or term mon, but the processor is only at 10%. The behavior is very strange and causes tracebacks. This happens on both c2900-universalk9-mz.SPA.151-4.M.bin and  c2900-universalk9-mz.SPA.151-3.T.bin. I am attaching a tracback and the config that works on some routers.
 

Oct 11 21:50:18.847 CDT: %BIT-4-OUTOFRANGE: bit 10 is not in the expected range of 0 to -1
-Traceback= 262ABB8Cz 216C5CC8z 222B4954z 222B64D0z 222B7D6Cz 22494B18z 2249B018z 224AA3E0z 23CFED44z 23CF5080z 237CC950z 237CC934z
Oct 11 21:50:41.179 CDT: %ALIGN-3-SPURIOUS: Spurious memory access made at 0x262ABB78z  reading 0x8
Oct 11 21:50:41.183 CDT: %ALIGN-3-TRACE: -Traceback= 0x262ABB78z 0x216C5CC8z 0x222B4954z 0x222B64D0z 0x222B7D6Cz 0x22494B18z 0x2249B018z 0x224AA3E0z 
Oct 11 21:50:41.183 CDT: %ALIGN-3-TRACE: -Traceback= 0x262ABAB0z 0x262ABB8Cz 0x216C5CC8z 0x222B4954z 0x222B64D0z 0x222B7D6Cz 0x22494B18z 0x2249B018z 
Oct 11 21:50:41.183 CDT: %ALIGN-3-TRACE: -Traceback= 0x262ABAC4z 0x262ABB8Cz 0x216C5CC8z 0x222B4954z 0x222B64D0z 0x222B7D6Cz 0x22494B18z 0x2249B018z 
Oct 11 21:50:41.183 CDT: %ALIGN-3-TRACE: -Traceback= 0x262ABF48z 0x216C5D3Cz 0x222B4954z 0x222B64D0z 0x222B7D6Cz 0x22494B18z 0x2249B018z 0x224AA3E0z 
Oct 11 21:50:41.183 CDT: %ALIGN-3-TRACE: -Traceback= 0x262ABF54z 0x216C5D3Cz 0x222B4954z 0x222B64D0z 0x222B7D6Cz 0x22494B18z 0x2249B018z 0x224AA3E0z 

 
bridge irb

!
interface GigabitEthernet0/0
 description <<Primary LAN>>
 encapsulation dot1Q 10
 no ip route-cache
 bridge-group 10

 duplex auto
 speed auto

!


interface SM1/0
 ip address 10.163.31.50 255.255.255.192
 service-module ip address 10.163.31.51 255.255.255.192
 !Application: SRE-V Running on SMV
 service-module ip default-gateway 10.163.31.50
 service-module mgf ip address 10.163.31.150 255.255.255.192
 service-module mgf ip default-gateway 10.163.31.145
!         
interface SM1/1
 description Internal switch interface connected to Service Module
 switchport mode trunk
!         

interface Vlan1
 ip address 10.163.31.145 255.255.255.192
!         
interface Vlan10
 no ip address
 bridge-group 10
!         
interface BVI10
 ip address 10.162.16.1 255.255.240.0
 ip helper-address 10.10.230.99
!      

bridge 10 protocol ieee
bridge 10 route ip
 

Hi Scott,

I just wanted to get some clarification regarding your topology and design first, and have a few questions below.

1. Is there a reason why you are not just sending packets over the vlan rather than bridging the Gigabit interface to the vlan? In our recommended configurations BVI is not required or utilized.


2. Also I think you've upgraded to SRE-V 1.5.1 correct? In that case, is there a reason why you are still using the mgf cli?


3. Do you intend to use the EHWIC card? The recommended configuration utilizes the EHWIC card as it offloads packets from the router cpu.


Thanks,

Brett

Hi Scott,

I've been discussing your configuration with other team members and we have the following questions below. Essentially we want to get a very clear understanding as to why your using BVI.

1. You mentioned that the router Gig0/0 is a switchport interface. Typically the switch trunks tagged vlan data to the router which means that the Gig0/0 interface is essentially a trunked interface as well. Maybe you could describe your topology which then might explain why the Gig0/0 interface is not a trunked interface.


2. Is there any special reason why you are not comfortable with router terminating the VLAN and MAC layer?


3. Are you using BVI due to issues with the Vlan10 interface not coming up and/or the point-to-point configuration failing?


4. When using EHWIC cards it sounds like your configuration works as desired, and that you're having issues only when not using this card?


Thanks,

Brett

Scott,

So your use case then is that you want to span the vlan across routers which is why you're using BVI correct? That would answer question 2 which was asking why not terminate the vlan at the router.

I set up and tested a working configuration which I've provided below. Vlan10 iniitially did not come up which I resolved by directly adding it the vlan database via the commands below.

#>vlan database
2951Router(vlan)#vlan 10


Since in the router interface gig0/0.10 you are using the statement 'encapsulation dot1q 10', vlan 10 needs to be set up on the switch which I did. A snippet of the switch configuration is below:

interface fastethernet 0/24
switchport access vlan 10

interface fastethernet 0/18
switchport mode trunk
switchport trunk encapsulation dot1Q


The router interface snippet is below. As I mentioned this configuration worked for me, so please take a look and let me know if it doesn't match your configuration/design and why.

bridge irb

interface GigabitEthernet0/0.10
encapsulation dot1Q 10
no ip route-cache
bridge-group 10

interface SM2/0
ip address 10.163.31.50 255.255.255.192
service-module ip address 10.163.31.51 255.255.255.192
service-module ip default-gateway 10.163.31.50
service-module mgf ip address 10.163.31.150 255.255.255.192
service-module mgf ip default-gateway 10.163.31.145

interface SM2/1
description Internal switch interface connected to Service Module
switchport mode trunk
no ip address
!
interface Vlan10
no ip address
bridge-group 10

interface BVI10
ip address 10.162.16.1 255.255.240.0
ip helper-address 10.10.230.99

bridge 10 protocol ieee
bridge 10 route ip