How to configure New Router T1CSU and ISDN BRI

[Guest_imported]

I am interested in Learning how to configure cisco routers. I have a Cisco 2621 Router as a test / learning piece of hardware... i am starting to get the basics on IOS commands and the different modes. I've already given the router a name etc. I installed 2 WIC cards - T1 CSU/DSU(wic-1dsu-t1) and a isdn bri (wic-1b-U).

I work for a small company who has an ISDN line in place. The Phone company has just installed a T1. I would like to have the 2621 hookup to T1 and have ISDN as a backup.

This is my first attempt at hooking up a Router. I need to configure the both wic's... the office consists of only 10 people. I have kind of been nominated as the technical person since I have some experience with NT Server, and 98 troubleshooting etc.

Is the hookup of the wics difficult? Is it something I can setup by looking at sample configs? Should we pay the ISP to come out and configure the router for us? I am not sure what protocol to use - RIP, OSPF??? What are the first steps in configuring the router. The T1 line is in, what info do I need from the ISP to configure the t1 wic? any sample configs would be greatly appreciated!

Thanks in advance
Michael

 

[wybnormal]

You want a CCNA course in 2 paragraphs and I'm afraid thats a bit tough..

No rip.. if anything use OSPF or EIGRP for the routing protocol but I'd be surprised if you need it talking to the ISP.

Normally you would put a static route that says

ip route 0.0.0.0 0.0.0.0 (interface)

Which means, If I, the router do know where this packets goes to, put it out on the said interface. Hence the name "default route"

There is a FAQ here in the cisco forum that explains the serial interface configuration to some degree.

Wander to you favorite online techie bookstore and get a copy of "Cisco Routers for IP routing" by Rudenko. It's part of the "Little Black Book" series. It's pretty well written in almost plain english ;-)

Cisco has many, many papers on configuring serial interfaces and ISDN all of which is free to the general public.

This link has many basic command line actions listed and samples:

http://www.cisco.com/univercd/cc/td/doc/product/access/iad/iad2420/2420sw/cli_cf.htm

This link deals specificly with configuring serial interfaces

http://www.cisco.com/univercd/cc/td/doc/product/software/ssr83/rpc_r/61110.htm

Hope this helps

Mike S


"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

 

[jeter]

Is this a frame-relay are a point-to-point T1 ?
How many channels ? There is alot of info needed
here in order for us to setup a config. here is a
site on frame relay and PPP.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_c/wcdfrely.htm

Let us know if you need more help !!!! Good Luck #-) J.Fisher CCNA
Jeter@LasVegas.com

 

[Guest_imported]

The T1 is a PPP. Full t-1 24 channels. thanks!

 

[abovebrd]

Take a look at the cisco site. Its full of sample configs.

good luck



-Danny

 

[Guest_imported]

Jeter,

can you give me some examples of the info the ISP should have provided regarding the T1... they didn't really give any info when installed. I am coming into this after the fact, and not 100% sure if the info was given in the beginning, or not.

 

[jeter]

The ISP should have given you the WAN ip and the Ethernet ip
( if your not running NAT <--- Network Address Translation )
The subnet mask ( example 255.255.255.240 this would give 14 static ip to use. Keep in mind that 1 ip is for the network and 1 ip is needed on the serial interface. They also need to give you DNS (<-- Domain name server ). I have
an Emergency to roll out on I will get your more later . J.Fisher CCNA
Jeter@LasVegas.com

 

[jeter]

OK here is a sample config on a point-to-point internet connection.

memory-size iomem 25
clock timezone PST -8
clock summer-time PDT recurring
ip subnet-zero
ip name-server 204.117.214.10
ip name-server 199.2.252.10 <---- DNS
ip name-server 204.97.212.10
!
!
!
!
interface Serial0
description To Internet
ip address 208.2.168.118 255.255.255.252 <---- Wan ip &
no ip directed-broadcast subnet mask
no fair-queue
!
interface Serial1
no ip address
no ip directed-broadcast
shutdown
!
interface FastEthernet0 <---- LAN ip and subnet notice
ip address 206.159.183.201 255.255.255.248 the subnet ->
no ip directed-broadcast
full-duplex
!
ip default-gateway 208.2.168.117 <---- this would be the
ip classless the network ip
ip route 0.0.0.0 0.0.0.0 208.2.168.117
ip http server
!
!

I hope this helps you out, Good Luck !!! #-) J.Fisher CCNA
Jeter@LasVegas.com

 

[rainman]

You said that you installed an integrated T1 WIC card in this 2601, so I'm assuming you're running your T1 directly into that.

Make sure you setup the proper timeslot information under your serial interface:

-----------------------------------
int s0
desc T1 to ISP
service-module t1 linecode b8zs
service-module t1 timeslots 1-24 (24 channels for a full T, or 64K per channel depending on what speed you get)
service-module t1 framing esf
service-module t1 clock source line
ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx (subnet)
no ip directed-broadcast
no cdp enable
encap hdlc
no shutdown
------------------------------------

You will have more to setup in your router however this will at least get your serial interface online to your ISP.


Rich Davies
rdavies@epix.net

 

[Guest_imported]

here is what i put in. the serial 0/0 changed status to up for about 30 seconds, but then went back down.... any ideas?


PAIR1(config)#interface serial 0/0
PAIR1(config-if)#description T-1 to A-Link
PAIR1(config-if)#service-module t1 linecode b8zs
PAIR1(config-if)#service-module t1 timeslots 1-24
PAIR1(config-if)#service-module t1 framing esf
PAIR1(config-if)#service-module t1 clock source line
PAIR1(config-if)#ip address 207.135.72.93 255.255.255.0
PAIR1(config-if)#no ip directed-broadcast
PAIR1(config-if)#no cdp enable
PAIR1(config-if)#encapsulation hdlc
PAIR1(config-if)#no shutdown
PAIR1(config-if)#^Z
PAIR1#
00:16:36: %LINK-3-UPDOWN: Interface Serial0/0, changed state to down
00:16:37: %SYS-5-CONFIG_I: Configured from console by console
00:16:55: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up
00:16:56: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed sta
te to up
00:17:17: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed sta
te to down

 

[rainman]

When you show the interface (sh int s0/0) are you seeing any errors on the circuit? It will list many types of errors at the bottom of this screen.

Also, you may need to find out what type of encapsulation your ISP uses. I think by default Cisco is set to HDLC but if your ISP is using PPP then you need to change it.


Rich Davies
rdavies@epix.net

 

[Guest_imported]

Here is what I see when looking at the s0 interface:
I know the encapsulation for my ISP is HDLC
PAIR1>show interface serial0/0
Serial0/0 is up, line protocol is down
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: T-1 to A-Link
Internet address is 207.135.72.93/24
MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 244/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input never, output 00:00:03, output hang never
Last clearing of &quot;show interface&quot; counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
1510 input errors, 0 CRC, 1510 frame, 0 overrun, 0 ignored, 0 abort
7606 packets output, 182584 bytes, 0 underruns
0 output errors, 0 collisions, 2536 interface resets
0 output buffer failures, 0 output buffers swapped out
2 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

 

[wybnormal]

DCD=up DSR=up DTR=up RTS=up CTS=up

This tells you that the phyiscal link is up and fine..
Data Carrier Detect is good.. Data Set Ready is good etc.. The fact the protocol is down speaks volumes about the encapsulation or channels are configured improperly for the link.

I'm guessing you do not have the encapsulation right. You said earlier that your T1 is PPP? Then the HDLC encapsulation is incorrect. Change it to be PPP encapsulation.

You might try dumping these lines and running the defaults.. I have not had to change from defaults with linecodes or framing( yet! )

service-module t1 linecode b8zs
service-module t1 framing esf
service-module t1 clock source line

I tend to keep my configs as simple as I can when troubleshooting.. if I do not *need* a line in it.. I remove it until things are working and then I add the lines back in one by one.

Mike S
&quot;Diplomacy; the art of saying 'nice doggie' till you can find a rock&quot; Wynn Catlin

 

[jeter]

something is terribly wrong here. The sample I posted before is how it should be set up. You have a 24 bit mask on a PPP T1. (?) . You really need to get with the isp and get the correct information and proceed. the interface shows
serial up protocol down that indicated a provisioning issue.
J.Fisher CCNA
Jeter@LasVegas.com

 

[Guest_imported]

I had the wrong subnet mask in before... Here is what I get when I do a show serial 0/0.

I don't seem to be getting any errors. the ISP can see my router, and believes everything is fine. However, when I try to browse web pages, I get timeout /dns errors. I suspect the name servers need to be put into the config of the router. What commands do I use for this? The ISP's name servers IP addresses are - 207.135.127.66 and 207.135.64.66

Thanks in advance!!! you guys are a great help!

PAIR1>show interface serial 0/0
Serial0/0 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: T-1 to ALINK
Internet address is 207.135.77.61/30
MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:05, output 00:00:01, output hang never
Last clearing of &quot;show interface&quot; counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
21 packets input, 504 bytes, 0 no buffer
Received 21 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
5 packets output, 1288 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

 

[rainman]

Can you ping the DNS servers from your PC? If not then you may not have TCP/IP configured correctly for this router.

Whatever IP you have configured on your ethernet interface on the router is the gateway you need to configure on your PC's. Once that default gateway is configured, all traffic will flow to the ethernet port on the router, then out through serial.

Again, before changing anything try pinging the DNS IP's (not the names) from your PC.


Rich

 

[jeter]

Your not going to be able to ping the DNS ( domain name server ). Its great that the serial is up now lets work on the ethernet. Did your ISP give you a ethernet ip or are you
going to to use NAT ( Network address Translation ) ? Let us know, so that we can help !!!! J.Fisher CCNA
Jeter@LasVegas.com

 

[Guest_imported]

The ISP did NOT give me a specific ethernet IP to use, I just assigned an IP address (one not in use from our block of ip addresses) to the ethernet port on the router. I guess we need to use NAT... CAn you help me in setting this up? What are the steps I need to take to set NAT up?

thanks!!!!!!

 

[jeter]

Check out this site.

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/805/805swcfg/advscen.htm

The Serial will have ( IP NAT OUTSIDE )
the Ethernet will have ( IP NAT INSIDE )
This command may be needed
( ip nat inside source list 1 interface serial 0 overload )

so set your network up for a private ip
192.168.1.1 for the routers ethernet , your first pc will
be 192.168.1.2 gateway 192.168.1.1 use subnet 255.255.255.0

The 2nd pc 192.168.1.3 subnet 255.255.255.0 gateway
192.168.1.1 etc, etc, etc.

Set your browsers up for a LAN access in internet explorer
go into options under connections the go through the setup
wizard. Good Luck !!! J.Fisher CCNA
Jeter@LasVegas.com

 

[Guest_imported]

ok, i'll try it Jeter. So I will need to change IP addresses and subnet mask for everything on the LAN right? Printers, pc's, servers? I'm assuming everything &quot;inside&quot; means 192.168.1.XX? what do I set the Serial port on the router too? where do I get the &quot;IP NAT outside&quot;

thanks!