cisco 2811 wic 1T:Serial0/0/0 is up, line protocol is down : how to resolve

[nicanor00]

I need to configure Cisco 2811 serial wic 1T but it doesn't work : Serial0/0/0 is up, line protocol is down

See the architecture in attachments

I don't know with type of equipment is used on remote side

See below the configuration of serial on remote site(the ISP have send it)

Serial4/7 is up, line protocol is up

Hardware is M8T-V.35

Description: CUS: ABCD

Internet address is 162.192.48.119/30

MTU 1500 bytes, BW 3584 Kbit, DLY 20000 usec,

reliability 247/255, txload 12/255, rxload 7/255

Encapsulation HDLC, crc 16, loopback not set

Keepalive set (10 sec)

Restart-Delay is 0 secs

See also the output command on my Cisco 2811 router in attachment

When I change the Cisco 2811 and use different router(not Cisco), it work

Please how can I solve this problem ?

[nicanor00]

Sorry my ISP address is

160.192.50.129

the serial wic 1T is connected opposite Comtech CRS 340 card

I made some research on this card.

See below the caracteristic of this card Comtech CRS 340 card

CRS-340 - EIA-422/-232, LVDS, G.703 Mixed Interface

(1) 25-pin 'D' type female connector

EIA-422/-530 DCE, V.35, SYNC EIA-232, LVDS

(1) 15-pin 'D' type female connector

G.703 Balanced (DDI, DDO, IDI, IDO)

(2) BNC type female connectors

G.703 Unbalanced, (DDI, IDO)

I use the (1) 25-pin 'D' on Comtech CRS 340 card

Do you think that the WIC 1T card can work opposite the Comtech CRS 340 card

[sachin_mon]

Hi,

Did you find any solution to this ? I am also having the same issue.

Please let me know. Thanks.

Rgds./Sack

[paolo bevilacqua]

Interface protocol down means circuit failure, complain to ISP.

[Richard Burts]

While circuit problems are a major source of line protocol down, there are a number of other things that will also cause line protocol to be down. Some of the things that come to mind include:

- layer 2 protocol mismatch (HDLC on one end and PPP on the other).

- running a layer 2 protocol that uses keepalives (such as HDLC) but the peer router is configured with no keepalive on the interface.

- no clocking (if the provider is not providing clocking on the circuit but you have configured clock source line).

- and one that I recently ran into - if you configure a GRE tunnel and get IPSec processing using the tunnel protection profile feature, but the crypto negotiation is not successful then the GRE tunnel is line protocol down - even though the circuit may be fine and you have working IP connectivity between the tunnel end points, the tunnel will be line protocol down.

HTH

Rick

[Leo Laohoo]

IF the ISP is refusing to check their side, ask them for a loop test.