Cisco 851 Frame Relay configuration

Posted on 2008-10-08
Last Modified: 2013-12-12
Basically I just needed help to configure Frame relay on the WAN interface (FE4) on this cisco switch.

I'm pretty much clueless on how to configure frame relay on this device.

this is the information i got from the ISP

Circuit ID:         LXXXXX
Bandwidth:          1.5Mbps

WAN IP Address:
WAN Subnet Mask:

Default Gateway:
Primary DNS Server:
Secondary DNS:

LAN IP Addresses: -
LAN Subnet Mask:

Local Access Details
Provider:           Frame Relay
Leased Line #:      490-1087 / 490-1088
VLAN ID:            415

any help will be appreciated,

Question by:jazz250
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Expert Comment

by:Don Johnston
ID: 22674374
I'm making some assumptions external CSU, inverse arp, etc.), but here goes:

conf t
int s1/0 (or whatever interface is connected to the frame provider)
 encapsulation frame-relay
 ip address
 no shut
ip route

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LVL 10

Accepted Solution

kyleb84 earned 300 total points
ID: 22675798
Sorry, but you cannot configure Frame Relay on a Cisco 851, as this is an Ethernet router.

If your ISP has installed a Frame Relay router (Probably a higher grade Cisco router) and left you with an 851 and a spare Ethernet port out of the ISP's router than this is the default configuration of an 851


(Connect to it via the Serial cable supplied, use Hyperterminal if you wish, 9600-8-N-1)

Paste this in, and:
- Replace all the [INSERT HERE] tags i've put in there with relevant data
- Fix up the XXX's in the IP's i've put in there

Let me know how you go!

conf t
logging buffered 8192
no logging console
no aaa new-model
ip cef
no ip bootp server
ip domain name
ip ssh version 2
username [A USERNAME] privilege 15 password [PASSWORD]
interface FastEthernet0
 spanning-tree portfast
interface FastEthernet1
 spanning-tree portfast
interface FastEthernet2
 spanning-tree portfast
interface FastEthernet3
 spanning-tree portfast
interface FastEthernet4
 ip address 19X.X.X.109
 no shut
interface Vlan1
 ip address
 no shut
ip route 19X.X.X.110
no ip http server
no ip http secure-server
access-list 22 permit
no cdp run
banner login ^C
* Access to this computer system is limited to authorised users only. *
* Unauthorised users may be subject to prosecution under the Crimes   *
*                       Act or State legislation                      *
*                                                                     *
* Please note, ALL CUSTOMER DETAILS are confidential and must         *
*                         not be disclosed.                           *
line con 0
 no modem enable
 transport output all
line aux 0
 transport output all
line vty 0 2
 access-class 22 in
 exec-timeout 20 0
 login local
 transport input telnet
line vty 3 4
 exec-timeout 20 0
 login local
 transport input ssh
scheduler max-task-time 5000

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LVL 10

Expert Comment

ID: 22675815
I should add:

Paste this in after the above one:

conf t
crypto key generate rsa
ip ssh version 2
wr me

You'll now have SSH access to it from the web, and the config will be saved.
LVL 23

Assisted Solution

Mysidia earned 200 total points
ID: 22855102
Frame relay is a serial technology, not a protocol built on or based on Ethernet.

To connect frame relay to your equipment you need a CSU/DSU with a serial interface,  or a router with a WIC that supports frame relay.

An 851 does not have any serial interfaces,  it has only ethernet interfaces.
And you cannot install a WIC in an 851.  
It is a fixed configuration router that you cannot add interfaces to.

If your  ISP/telco has provided you with a plain old ethernet port to access your frame "circuit" ,   then the configuration is just as with a normal Ethernet

You apply the ip address to the interface, or enable DHCP client (if the ISP equipment is serving your ip using DHCP).

However, you cannot just plug an  Ethernet cable into the smart jack and have it work.
i.e.  Ethernet interface to ethernet is ok...     Ethernet to T1/frame relay is not.


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