01-15-2014 03:47 AM - edited 03-04-2019 10:05 PM
Hi guys, I have a problem. I am trying to make E0 and S1 interfaces on RouterA bridge. There is a PC in LAN1 and it's Ip:10.0.0.2.
S0 on RouterB's Ip: 10.0.0.1. When i try to ping from the PC to 10.0.0.1, it sends an ARP packet. After the packet left S1 interface it looks like that from top to bottom: ARP/Ethernet/HDLC/Frame.
When the packet reachs S0 interface It does nothing. As if it does not understand ARP and does not response. What is the problem. Thanks.
Solved! Go to Solution.
01-15-2014 01:17 PM
What is the problem that you're trying to solve? Maybe we can come up with a workaround or another solution. You can bridge the ethernet and serial, but you have to go through the serial interface and not terminate on it. That means that you should be bridging on RouterB as well, but I know that may not be an option.
HTH,
John
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01-15-2014 04:18 AM
You'll need to configure irb on RouterA:
bridge irb
int e0
no ip address
bridge-group 1
int s1
no ip address
bridge-group 1
int bvi1
ip addres
bridge 1 route ip
bridge 1 protocol ieee
I haven't tested this yet, so there could be some syntax errors.
HTH,
John
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01-15-2014 04:29 AM
Okay, I tested. How do you have RouterB configured? What is S0's interface? The only way that you should be able to get this to work with both hosts being on the same subnet would be to bridge both routers like I stated above. I could get that to work. Otherwise, let's assume that Lan1's host is 10.0.0.1. In order for it to get to the other side through RouterA, RouterA can bridge, but RouterB's S0 address would need to be in the 10.0.0.0/24 subnet and still route. Then Lan1 host would use RouterB's S0 interface ip as a default gateway, but you still wouldn't be able to have Lan2's host on the same subnet as Lan1's host.
HTH,
John
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01-15-2014 06:05 AM
Hi John, there is 10.0.0.1/24 on RouterB's S0. That is the all configuration on it. S0 is a serial interface whis is configured with 9600 clock rate. the PC's Ip:10.0.0.2/24 both PC and S0 on the same subnet. But it doe not work. Below is wireshark capture when packet arrives RouterB's S0. It just does not response to the ARP packet. Thank you.
01-15-2014 07:10 AM
Can you post the config of RouterA?
Note: Serial interfaces won't have arp entries associated to them. I'm not sure what you're trying to do will work, but if you can post the config of RouterA and RouterB we can take a look.
HTH,
John
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01-15-2014 10:13 AM
RotuterA:
hostname RouterA
!
interface Serial1
no ip address
serial restart-delay 0
bridge-group 1
!
interface FastEthernet0
no ip address
duplex auto
speed auto
bridge-group 1
!
!
interface BVI1
no ip address
!
!
bridge irb
bridge 1 protocol ieee
bridge 1 route ip
RouterB:
!
hostname RouterB
!
interface Serial0
ip address 10.0.0.1 255.255.255.0
clock rate 9600
!
That is all.
01-15-2014 10:48 AM
I don't believe you're going to be able to get this to work. I've labbed it up and it simply doesn't work to the wan interface because serial interfaces don't work like lan interfaces do. They don't use arp. I took the same config that you have and it doesn't work, but if I link an FE interface between R2 and R3, it works fine with the ip address being on R3's lan interface. Change the link between RouterA and RouterB to an ethernet link and you'll see what I mean...
HTH,
John
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01-15-2014 11:06 AM
Thank you John, I know you are right, but I need to bridge an ethernet and a serial interface.
01-15-2014 01:17 PM
What is the problem that you're trying to solve? Maybe we can come up with a workaround or another solution. You can bridge the ethernet and serial, but you have to go through the serial interface and not terminate on it. That means that you should be bridging on RouterB as well, but I know that may not be an option.
HTH,
John
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01-16-2014 02:07 AM
Actually I want to make a scenario like below, bridging two diffrent interface. Anyway thank you for your kind help.
no ip routing
no ip cef
controller DSL 0/0
mode atm
line-term cpe
line-mode 2-wire line-zero
dsl-mode shdsl symmetric annex B
line-rate auto
interface ATM0/0
no ip address
no ip route-cache
no atm ilmi-keepalive
bridge-group 1
pvc 8/35
encapsulation aal5snap
interface FastEthernet0/0
ip address 10.10.10.11 255.255.255.0
no ip route-cache
speed 100
bridge-group 1
access-list 1 permit 10.10.10.0 0.0.0.255
bridge 1 protocol ieee
01-16-2014 04:13 AM
No problem. From your config above, I'm still not sure what you're trying to accomplish though. Here's a document on the irb feature. There could be restrictions on what interfaces can be bridged, but I have no way of testing atm interfaces unfortunately:
http://www.cisco.com/en/US/tech/tk389/tk815/technologies_tech_note09186a0080094663.shtml
http://www.cisco.com/en/US/docs/optical/15000r4_0/ethernet/454/guide/irb.html
HTH,
John
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