Question

Cisco 805 Configure routing between ethernet and serial interface

Asked by: packetninja

Hi All,
Not being much of a cisco expert I need a few pointers on configuring a cisco 805 for X.21
the router has an ethernet , console and serial port.
currently the ethernet port is connected to the LAN and the serial port is connected to a kilostream serial connection to an identical router in another city.
what i need to do is configure routing between the ethernet and serial port, I've a reasonable knowledge of IP routing (routing tables adding routes but no experience of cisco kit).
Can I have a few pointers please.

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Asked On
2004-05-26 at 09:03:01ID21003059
Tags

cisco

,

805

,

routing

,

serial

,

between

Topic

Network Routers

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: JFrederick29Posted on 2004-05-26 at 09:20:59ID: 11163035

Routing between the connected interfaces on a router occurs without any configuration as long as the interfaces are up and have valid layer 3 addresses.  To demonstrate, you should be able to ping the serial interface of the router from a workstation on the ethernet LAN.
 
To view the routing table:

show ip route

To view the interfaces up/down status and layer 3 addressing:

show ip interface brief

What problems are you experiencing with the router? Unable to communicate with the ethernet LAN on the remote site?

 

by: scraig84Posted on 2004-05-26 at 09:32:05ID: 11163152

JFrederick is correct, but the remote router will not have knowledge of the Ethernet subnet automatically.  Likewise, your local router will not have knowledge of any internal subnets connected to the remote router.  This is where you need to set up a routing protocol on both routers or supply them both with static routes.  If you supply some more information on what you are trying to accomplish and possibly the addresses or networks involved, someone can probably provide you with additional info.

 

by: packetninjaPosted on 2004-05-26 at 12:13:15ID: 11164636

Thank you both, I'm also willing to up the points by another 500 for a 'fix' by tommorrow.

the config is as follows

site B
 211.10.0.6 (internal Lan) ethernet
     |:::::::|
unknown IP (serial port on kilostream connection, i presume now this needs an IP)
         |
         |
         |        
         |
unknown serial port IP
     |:::::::|
211.10.0.5
site A

can some please post either a script or config file , I'll split the points (1000) total

 

by: JFrederick29Posted on 2004-05-26 at 12:30:33ID: 11164810

Are you wanting to bridge the LAN's together or do you have two seperate subnets to route between?  If you want to route between the two LAN's you will need to use seperate subnets on the ethernet LAN's and use private IP addressing on the serial interfaces.

If you want to bridge, the following config will work:

Site B Router:

bridge irb
bridge 1 protocol ieee
bridge 1 route ip

interface ethernet0
no ip address
bridge-group 1

interface serial0
no ip address
bridge group 1

interface bvi1
ip address 211.10.0.6 255.255.255.0 (or whatever mask you are using)

Site A Router

bridge irb
bridge 1 protocol ieee
bridge 1 route ip

interface ethernet 0
no ip address
bridge-group 1

interface serial0
no ip address
bridge-group 1

interface bvi1
ip address 211.10.0.5 255.255.255.0 (or whatever mask you are using)

 

by: packetninjaPosted on 2004-05-28 at 03:18:16ID: 11178821

posting another questino for point additional 300 for JFrederick29
additional 200 for scraig84

20120131-EE-VQP-002

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