2 Meg Serial Circuit issue.

Amjad Hashim · ‎04-19-2011

Hello Experts,

I have a bunch of 2meg sites connected to a 7200 series router through serial interfaces. As per my knowledge the ISP is suppose to provide us clock and on our DTE (Routers on both end) we need to configure bandwidth 2000 command for 2 meg circuit.

But service provider is saying that their 2 meg is set to slave

"

the customer needs to set his A end kit to master but can't as equipment not able to set his pop end eqivalent to DTE

there is a clock signal coming from 2meg cct but this is free running and drifts "

i can see clock coming through sh controller command and i am using x.21 cable with DTE end connected to my router.

Service provider is saying that they are not providing clocking so i think we have to configure one of our end to provide clock and other end to use bandwidth command. If you guys know how BT set their equipment it will make it lot easier for me.

Thanks in advance.

Regards.

esomarriba · ‎04-19-2011

Hi Amjad,

What problems are you facing? packet-loss?

Amjad Hashim · ‎04-20-2011

Hello Esomarriba,

We have huge number of input and CRC errors on interfaces and because of the errors sometimes our routers lose EIGRP neighbour relationship and ofcourse links are running very slow.

Cheers!

ciscoben2009 · ‎04-20-2011

Is the line showing as up up?

We have had a few line with BT in the past and the clocking always came from there end as it dictates what the speed of the line is

Can you do a show interface and paste the result please?

Amjad Hashim · ‎04-20-2011

Hello Ben,

Here is the show interface output

Serial1/3 is up, line protocol is up
Hardware is M8T-X.21
Description: ** Wellclose CoIN **
Internet address is 10.99.250.10/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 15/255, rxload 2/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters 23:25:32
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 265
Queueing strategy: weighted fair
Output queue: 0/1000/64/265 (size/max total/threshold/drops)
     Conversations 0/98/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec
5 minute input rate 18000 bits/sec, 15 packets/sec
5 minute output rate 96000 bits/sec, 16 packets/sec
     782415 packets input, 149985554 bytes, 0 no buffer
     Received 9825 broadcasts, 0 runts, 0 giants, 0 throttles
     288333 input errors, 288313 CRC, 0 frame, 17 overrun, 0 ignored, 3 abort
     703344 packets output, 444509585 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions     DCD=up DSR=up DTR=up RTS=up CTS=up

and find show controller output for the same interface

COIN_Serial_Mlx#sh controllers s1/3
M8T-X.21: show controller:
PAS unit 3, subunit 3, f/w version 3-101, rev ID 0x2800001, version 3
idb = 0x645AEED8, ds = 0x20090C28, ssb=0x645AFB6C
Clock mux=0x0, ucmd_ctrl=0xC, port_status=0x73
Serial config=0x8, line config=0x302
maxdgram=1608, bufpool=32Kb, 64 particles
DCD=up DSR=up DTR=up RTS=up CTS=up
line state: up
cable type : V.11 (X.21) DTE cable, received clockrate 2047212

base0 registers=0x3C800000, base1 registers=0x3C802000
mxt_ds=0x505F0B28, rx ring entries=37, tx ring entries=64
rxring=0xC34A260, rxr shadow=0x645AFF28, rx_head=12
txring=0xC34A3E0, txr shadow=0x500B6B14, tx_head=41, tx_tail=41, tx_count=0
throttled=0, enabled=0
halted=0, last halt reason=0
Microcode fatal errors=0
rx_no_eop_err=3, rx_no_stp_err=0, rx_no_eop_stp_err=0
rx_no_buf=0, rx_soft_overrun_err=42, dump_err= 0, bogus=0, mxt_flags=0xC
tx_underrun_err=0, tx_soft_underrun_err=0, tx_limited=1(2)
tx_fullring=296870043, tx_started=529585017, mxt_flush_count=0
rx_int_count=1212610475, tx_int_count=1438064218
Half-duplex hdx=0x500B69C4, summary:-

invalid_state=0, jigged_sig=0, invalid_timeout=0, tx_drop=0
tx_int_err=0, rx_drop=0, timer_error=0, rts_timeout=0
invalid_rx=0, tx_lost_cts=0, cts_timeout=0, late_rx=0

ciscoben2009 · ‎04-20-2011

it saying you have the DTE end of the cable pluged in and you are reciveing a clock rate 2047212

if there was no clock rate the layer 2 part of the line wouldnt be up at all is there a box that your serial cable plugs in to think BT call them a "quick eagle"

I am guessing this a point to point link between two of your sites?