Table of Contents
Cisco ADSL & 1841 router
My Cisco 877 worked well but a few months ago started to reboot randomly. The cause of this is undetermined, but possibly PSU related. But the PSU has a cisco propretry connector so I cannot test by substitution. Consequently I decided to update to a new model, hence 1841.
ADSL 1841 routing config
ADSL 1841 NAT config
The physical layout is differnet to the 877, so I have included it below.
Connections
| Key | Legend | Key | Legend |
|---|---|---|---|
| 1 | Slot 1 for WIC | 7 | USB port |
| 2 | Kensington Lock slot | 8 | FastEthernet 0/0 |
| 3 | FastEthernet 0/1 | 9 | Aux Port |
| 4 | Serial Console | 10 | Power Switch |
| 5 | Slot2 for WIC | 11 | Mains power inlet |
| 6 | Compact Flash card slot |
Config changes
The port designations are different for this model, but apart from this and a different IOS version, my running config is substantially the same as the 877.
Troubleshooting
Following is when router is operating normally, line is UP:-
1841-adsl#show controllers atm 0/0/0
Interface: ATM0/0/0, Hardware: HWIC-DSLSAR (with Alcatel ADSL Module), State: up
IDB: 66890E8C Instance: 668B239C reg_dslsar:50520000 adsl_regs: 50560000
fpgaRegs:50408000 alcRegs: 50580000
...
...
ADSL Register Value Notes
--------------- ---------- ----------
intr_enable_reg: 0xC1C VCCLOSED.JUMPC.RQAF.RPQAF.TBQAF.
ADSL Config Reg 0x000D8C80 CD LED on;
LT-TE Mode = TE;
NTR Pass Thru = 0;
NTR Enable = 1;
OK LED on;
LOOPBACK LED off;
This is when line is DOWN:-
#show controllers atm 0/0/0
Interface: ATM0/0/0, Hardware: HWIC-DSLSAR (with Alcatel ADSL Module), State: up
IDB: 66890E8C Instance: 668B239C reg_dslsar:50520000 adsl_regs: 50560000
fpgaRegs:50408000 alcRegs: 50580000
.... edited ....
ADSL Register Value Notes
--------------- ---------- ----------
intr_enable_reg: 0xC1C VCCLOSED.JUMPC.RQAF.RPQAF.TBQAF.
ADSL Config Reg 0x000D8C80 CD LED on;
LT-TE Mode = TE;
NTR Pass Thru = 0;
NTR Enable = 1;
OK LED on;
LOOPBACK LED off;
Gen ADSL over POTS Annex M error int on bad ADSL over POTS Annex M access
ADSL Int Enable 0x00000003 ADSL over POTS Annex M normal interrupt enabled
ADSL over POTS Annex M error interrupt enabled
DSLSAR Register Value Notes
--------------- ---------- ----------
config: 0x600D0A20 RXEN.RegulateXmit.RMCell.TXEN.
Rx Buffer size: 1024. RCT: Large, VPI Bits: 8.
status: 0x00000000
rpq_base: 0x0EDEA000
rpq_head: 0x0EDEAB00 (176 entries from base)
rpq_tail: 0x0EDEAB00 (0 entries from head)
clkPerCell: 2184972 (line rate: 1242 Kbps)
Tx Error: 0x00000000
Lookup Error cnt: 0x00004FDB Cell Rx-ed with no Open RCTEntry.
Invalid Cell cnt: 0x00000002 Rx-ed Cells had non-zero GFC field.
Tx packet: 0x00C914C0
Tx OAM: 0x00000000
Rx packet: 0x002EEF9E
Rx packet drop: 0x0000005A
Rx OAM: 0x00000000
Rx OAM drop: 0x00004FDD
Timer: 0x00000000
tstBase1: 0x0001B718 TST boot jump.
Pre-timer Count: 333
rcid_tableBase: 0x00000000
rct_base: 0x00011000
fbq_base: 0x0001F800
fbq_head: 0x0001FEC0 (432 entries from base)
fbq_tail: 0x0001FEE4 (9 entries from head)
rawCellBase: 0x0EDE8000
rcq_head: 0x0EDE8000 (0 entries from base)
rcq_tail: 0x0EDE8000 (0 entries from head)
Last Addr: 0x00000000
tbq_base: 0x0EDEB000
tbq_head: 0x0EDEB7A0 (244 entries from base)
tbq_tail: 0x0EDEB7A0 (0 entries from head)
DSLSAR Spurious Interrupts:0x0
DSLSAR Interrupts: 0xE
VC Closed: 0x3
JMP-COMPLETE:0x9
FIFOF: 0x1
FBQE: 0x1
Last Addr:0x0
Host Memory Qs Value Notes
--------------- ---------- ----------
rxCellQ: 0x0EDE8000
rxPacketQ: 0x0EDEA000
txBufQ: 0x0EDEB000
txPakInfo Array
Index vcd pak Ptr particle Ptr
----- --- ------- ------------
rx_particleArray:
Index ParticlePointer
----- ---------------
432. 0x668DC5C0
433. 0x668DC500
434. 0x668DC4C0
435. 0x668DC600
436. 0x668DCF80
437. 0x668DC640
438. 0x668DC540
439. 0x668DC580
440. 0x668DC6C0
VC QoS Summary
--------------
Active Configured Scheduled
Connections
VCD VPI/VCI COS PCR SCR/MCR COS PCR SCR/MCR
--- --------- -------- ------ ------- -------- ------- --------
1 0 /38 UBR 1242 n/a UBR 1242 n/a
Connections RX RX RX RX RX TX TX TX TX TX TX
VCD VPI/ VCI AAL5 AAL2 RAW Chain Drop AAL5 AAL2 RAW TSI Drop MISS
--- --- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
0 0 /0 0 0 0 0 0 0 0 0 0 0 0
1 0 /38 39850 0 0 0 6 38388 0 0 0 58 0
Receive Connection Table:
VC AAL
VCD VPI/ VCI controlStatus open type
---- -------- ------------- ---- ----
1 0 / 38 35EA0000 Yes AAL5
Tx Queues: |<-- TCD Contents -->|<---- tcqTail TBD Contents --->|
VCD(VPI/VCI) Queue tcqTailbase Tail Head control bufAddr aal5Ctrl cellHdr
------------ ----- ----------- ---- ---- -------- -------- -------- --------
0 (0 /0 ) LOW 20000 0 0 DAAA2AAA BAAA2EEE 2CABAEAA B2A2AAAA
HIGH 38000 0 0 EBA868B8 9EBAE0B8 BAAABAAA AAAA22AB
1 (0 /38 ) LOW 21000 0 0 ABAA03AA AEBA0E2A AAEAA2A8 A2A8AEA6
HIGH 39280 28 28 8020052 EC6142C 52 262
OAM pak statistics [vcd/tx/dropped]:
1/0/0
OAM enqueue failures : 0
OAM Bad VCD drops : 0
OAM cells handled inline: 0
OAM Max Tx time Statistics:
1 : < 4 msec
OAM used samples : 0
OAM ignored samples : 0
Queue Statistics
TxQInfo for vcd 0
--------------------
tx_ring_limit=10, max_tsi_seq_num=0, max_tx_time=178800
Total number of packets = 0
Total number of packets transmitted = 0
Total number of packets dropped = 0
HP TxQInfo for vcd 0
--------------------
tx_ring_limit=30, max_tsi_seq_num=0, max_tx_time=178800
Total number of packets = 0
Total number of packets transmitted = 0
Total number of packets dropped = 0
TxQInfo for vcd 1
--------------------
tx_ring_limit=10, max_tsi_seq_num=0, max_tx_time=1744
Total number of packets = 0
Total number of packets transmitted = 0
Total number of packets dropped = 0
HP TxQInfo for vcd 1
--------------------
tx_ring_limit=30, max_tsi_seq_num=0, max_tx_time=1744
Total number of packets = 7300
Total number of packets transmitted = 7300
Total number of packets dropped = 0
1841-adsl#
