I've been saving this one for a while also. Originally I was going to write
this off as another one of those questions. Then I got to wondering about
the genesis of it. Did a bit of research. Interesting.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_
c/wcdfrely.htm#xtocid15531103
watch this word wrap...
the short answer to Mr. Ozbourne's question is yes it can be done. The
question itself indicates a bit of uncertainty. I know when I was
considering it, and poking around CCO, my thought was that tunnels are layer
three and frame relay is layer two and therefore no it can't be done.
But Cisco continues to be full of surprises. The IOS is very rich in
features that allow one to do a wide variety of things in any number of
ways. Sometimes I'm too dense to understand the reasons behind the
possibilities.....
So....
1) One may use Cisco routers as frame relay switches.
2) One may use Cisco routers as X.25 switches
3) One may tunnel frame relay and X.25 and SNA and any number of other
things over IP networks.
For example, if one were migrating an enterprise to an IP only backbone, but
one had an extensive embedded base of whatever, one would take advantage of
the rich Cisco feature set to make this possible. So I have a New York
office, a Los Angeles office, and Fargo office. I want a high speed core,
using DS3. Can't do X.25 over DS3, so I have to fake out my existing X.25
network by making my Cisco edge routers X.25 switches and tunnelingX.25
across the backbone. OK I understand the theory. Same for SNA. But for
frame-relay I'm scratching my head.
Network-----frame_relay----router------IP_Core_Network--------router-----fra
me-relay-----network
Possibly there might be some advantage to create such tunnels so that
routers are but one hop away from eachother? Possibly I am looking at this
the wrong way, and the issue is one of a large organization with a bunch of
Stratacom switches in various locations, and wanting to take advantage of a
high speed core somehow? I get the feeling that this feature exists as a
means of helping transition from one structure to another. I just don't
understand the structures involved.
Chuck
P.S. Yes Dave, your configurations will work. They are almost identical to
configurations found in the link above.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Dave
Ozbourne
Sent: Thursday, July 13, 2000 8:48 PM
To: [EMAIL PROTECTED]
Subject: 2 2501's as a frame relay switch - Once and For All
Searched the archives on Groupstudy and found varying answers on the
follwoing config, for 2 2501's connecting through a tunnel to simulate
a frame relay switch.
Does it work yes or no?
Thanks
Cisco 2501 # 1
!
version 11.2
service udp-small-servers
service tcp-small-servers
!
hostname r1
!
!
frame-relay switching
!
interface Tunnel0
no ip address
tunnel source Ethernet0
tunnel destination 192.168.1.1
!
interface Ethernet0
ip address 192.168.1.2 255.255.255.0
!
interface Serial0
no ip address
encapsulation frame-relay
clockrate 1000000
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 112 interface Serial1 211
frame-relay route 113 interface Tunnel0 311
frame-relay route 114 interface Tunnel0 411
!
interface Serial1
no ip address
encapsulation frame-relay
clockrate 1000000
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 211 interface Serial0 112
!
no ip classless
!
line con 0
line aux 0
line vty 0 4
login
!
end
Cisco 2501 # 2
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname r2
!
!
frame-relay switching
!
interface Tunnel0
no ip address
tunnel source Ethernet0
tunnel destination 192.168.1.2
!
interface Ethernet0
ip address 192.168.1.1 255.255.255.0
!
interface Serial0
no ip address
encapsulation frame-relay
clockrate 1000000
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 311 interface Tunnel0 113
!
interface Serial1
no ip address
encapsulation frame-relay
clockrate 1000000
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 411 interface Tunnel0 114
!
no ip classless
!
!
line con 0
line aux 0
line vty 0 4
login
!
end
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