07-16-2003 02:38 AM - edited 03-02-2019 08:53 AM
Hello all,
I am looking to bridge 2 cisco 2620's over a leased line but I have never had to do this before and am having trouble finding out how it should be done. Does anyone have a good link i can look at or even just a list of the basic commands i should use ?
cheers
07-16-2003 03:08 AM
hi
Here the configuration guides for the different bridging you can configure.
I guess the one you need is the transparent bridging guide.
Still if you can i would not implement bridging. if you can i would go with routing.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fibm_c/bcfpart1/index.htm
Hope that helps
Roger
07-16-2003 03:23 AM
Hi,
here is a config example (this was used for Frame-relay WAN but leased line should be similar):
!
ip subnet-zero
no ip routing
!
interface Ethernet0
ip address ......
no ip route-cache
bridge-group 5
!
interface Serial0
no ip address
encapsulation frame-relay
no ip route-cache
cdp enable
frame-relay lmi-type ansi
bridge-group 5
!
interface Serial0.x point-to-point
ip address ........
no ip route-cache
frame-relay interface-dlci x
bridge-group 5
!
ip default-gateway y.y.y.y
ip classless
!
bridge 5 protocol ieee
!
This was for router which bridges only, not routing at all.
If you want to configure Integrated Routing and Bridging see http://www.cisco.com/warp/public/473/741_10.pdf
For Concurent Routing and Bridging see
which is a part of
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fibm_c/bcfpart1/bcftb.htm
document containing all possible details about IOS bridging.
Regards,
Milan
07-16-2003 03:24 AM
Hi,
here is a config example (this was used for Frame-relay WAN but leased line should be similar):
!
ip subnet-zero
no ip routing
!
interface Ethernet0
ip address ......
no ip route-cache
bridge-group 5
!
interface Serial0
no ip address
encapsulation frame-relay
no ip route-cache
cdp enable
frame-relay lmi-type ansi
bridge-group 5
!
interface Serial0.x point-to-point
ip address ........
no ip route-cache
frame-relay interface-dlci x
bridge-group 5
!
ip default-gateway y.y.y.y
ip classless
!
bridge 5 protocol ieee
!
This was for router which bridges only, not routing at all.
If you want to configure Integrated Routing and Bridging see http://www.cisco.com/warp/public/473/741_10.pdf
For Concurent Routing and Bridging see
which is a part of
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fibm_c/bcfpart1/bcftb.htm
document containing all possible details about IOS bridging.
Regards,
Milan
07-17-2003 02:02 AM
Hello,
thanks for your replies so far. I have a basic bridge now working (see below)but I have run into a problem. All was working well and I could see the arp table picking up mac addresses until I rebooted the cisco's. They have now stopped bridging and I have noticed that the entry 'no ip mroute-cache' has been added to the interfaces. What does this command do ? When I try to remove the command I get the following message :
IP unicast fastswitching has to be enabled on a physical interface
What does this mean and am I missing some commands?
A copy of the config of one of the routers is below, they are both v similar. Any help would be greatly appreciated:
version 12.2
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname xyxyxyx
!
no logging console
!
ip subnet-zero
no ip routing
!
!
no ip domain-lookup
!
!
!
!
interface FastEthernet0/0
ip address x.x.x.x y.y.y.y
no ip route-cache
no ip mroute-cache
duplex auto
speed auto
bridge-group 1
!
interface Serial0/0
ip unnumbered FastEthernet0/0
encapsulation ppp
no ip route-cache
no ip mroute-cache
no fair-queue
clockrate 64000
bridge-group 1
!
ip classless
ip http server
ip pim bidir-enable
!
!
bridge 1 protocol ieee
banner motd ^C
#########################################################################
abababababababababababababababababababababababababab
#########################################################################
^C
!
line con 0
password xxxxx
login
line aux 0
line vty 0 4
password xxxxxxx
!
!
end
Thanks
Richard
07-17-2003 03:18 AM
hi
The ip mroute-cache command enables multicast fastswitching.
It is the same for the ip route-cache command.
As the command reference says the fastswitching is for ip routing. so i guess if you disable ip routing on the router it will automatically disable fastswitching.
But it should not have an impact for you.
Does the bridging not work anymore?
Regards
Roger
07-17-2003 03:51 AM
Roger,
the bridge is not working at the moment. It was working last night and i did a 'copy r s'and powered down the routers for the night. This morning they have both booted ok but will not talk to each other. The only difference I can see is that the command 'no ip mroute-cache' has been added to all interfaces on both routers. I can only assume that this is the problem but do not know how to rectifiy this,
Thanks
Richard
07-17-2003 07:54 AM
Chaps,
I have just run 'debug arp' and received the following response :
IP ARP throttled out the ARP request for IP x.x.x.x
Does anyone know what this means and how to fix it ?
regards
07-18-2003 03:11 AM
Hi,
I beleive the problem is PPP.
Try to use HLDC or LAPB multi instead of it.
for config example.
Regards,
Milan
07-18-2003 05:16 AM
Hi
you have specified an ip address on the ethernet interface. for bridging that isn't necessary. do you really want the router to be ip addressable (for instance to telnet to it)?
if you have an ip address specified, the ip protocol gets automatically routed (you can check it with the command "show int crb").
therefore, you can either remove the ip address or you can the router "force" to bridge ip:
with
bridge 1 no route ip
regards
HRB
07-21-2003 01:00 AM
Hello,
many thanks for the previous replies to my problem. I have tried to change the encaps but this does not seem to make a difference, I still get the same debug messages. I have also tried the 'bridge 1 no route ip' command but it will not accept it. I have issued the no ip routing command, does this have the same effect ?
I have issued the 'sh int crb' command and get the following response :
1. Both int f0/0 and s0/0 sh ip protocol active and the the only mac addresses that has any traffic stats is the physical broadcasts. All other counters are zero.
I am only trying to set up a simple bridge ( i.e no routing at all on the router ) so I am not sure what else I can try. Any ideas ???
07-21-2003 01:03 AM
Hi
What is your actual config? Can you post it?
Regards
Roger
07-22-2003 12:21 AM
Roger,
the config of the 2 routers is as above. I have tried little extras but they havent worked so I have removed them,
regards
Richard
07-22-2003 12:44 AM
All you need is at both ends;
no ip routing
int fast 0
bridge-group 1
no ip address
int serial 0
no ip address
bridge-group 1
bridge 1 protocol ieee
I see that IP addresses are existing on physical ports. These are really not needed.
You can also check whether bridging is active or not by using
show bridge
command. This would help you to see one side's MAC address table at the other side and vice versa.
Hope this helps,
Turkeer
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