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Home > Archive > CCNP > February 2002 > Help! back-to-back...line protocol down.
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Help! back-to-back...line protocol down.
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| jane55 2002-02-18, 8:04 pm |
| Router1
Hardware is HD64570
Internet address is 176.16.0.6/16
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation PPP, loopback not set, keepalive set (10 sec)
LCP Listen
Closed: IPCP, CDPCP
HD unit 1, idb = 0x105294, driver structure at 0x10A728
buffer size 1524 HD unit 1, V.35 DTE cable
cpb = 0xE5, eda = 0xC140, cda = 0xC000Serial0 is up, line protocol is down
Router2
Hardware is HD64570
Internet address is 176.16.0.5/16
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation PPP, loopback not set, keepalive set (10 sec)
LCP Listen
HD unit 0, idb = 0xC8AE8, driver structure at 0xCCE78
buffer size 1524 HD unit 0, V.35 DCE cable, clockrate 64000
cpb = 0xE4, eda = 0xDA80, cda = 0xD800 | |
| scoulter 2002-02-18, 9:49 pm |
| It might be worthwhile to post the config for each of these serial i/f's, could be just an addressing issue or a faulty cable.
do a show controller serial [i/f ID]
check your DTS , another option is to go ip unnumbered, or use 2 DTE cables with a nullmodem in between, also remember SLARP if your IOS supports it, just configure your ip address on one end. check your clockrate commands too | |
| Yankee 2002-02-19, 4:05 am |
| Is this a real circuit or a lab? Protocol down is layer 2.
If you are simulating a point to point circuit use encap hdlc, a dce/dte crossover cable and the clock rate command on the DCE interface.
Seeing the serial config on both ends would help too.
Yankee | |
| MadChef 2002-02-19, 5:07 am |
| I'm guessing that R2, which is DCE, doesn't have a clock rate specified. I differ from yankee in that I always use ppp encap, but that's just personal preference.
MadChef | |
| RTRGOD 2002-02-20, 11:17 am |
| When line protocol is down, it usually suggests one of two things. An encapsulation mismatch or a clocking problem. Since you claim that both routers are running PPP, encapsulation is probably not the problem. Also, I doubt that the earlier suggestion to configure HDLC will do anything for you. PPP is always the better choice simply because of the proprietary nature of HDLC.
You are probably having a clocking problem. If this is the a lab environment, you are missing the CLOCKRATE command on the router with the DCE cable. If this is a production environment, you have a CDU/DSU issue. | |
| Yankee 2002-02-20, 7:47 pm |
| Pssst....my mention of HDLC wasn't the fix for the problem and since it is two Cisco routers the proprietary nature of HDLC ain't a problem. The clock rate was my primary concern, but when I run into problems I always recommend defaults to start, thus the HDLC comment.
Yankee | |
| peterd 2002-02-21, 2:57 am |
| Hi Guys,
in the original message, second line up from the bottom, it states 'clockrate 64000' so it looks like it's set.
It looks more like a faulty cable...either not pushed fully home, a bent pin in one of the plugs or a broken conductor in the cable or a plug.
Jane55, have you tried different cables?
If so and it's still faulty, perhaps you could post the full config?
Regards
Peter | |
| Yankee 2002-02-21, 7:46 pm |
| Touche...I saw that in between my posts but forgot...me bad, good catch.
Yankee |
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