DDN configuration and 26XX password recovery

Mentioned in the masterpiece cqcayee :]
: Please kindly advise how to configure DDN in CISCO 2611, in addition, I would like to ask you how to restore a wide area network card from an old 2611 with a password), that is, return to the initial setting status. Thank you.
:
: My mailbox: cqcayee@sohu.com
:
:......
A:

1: ddn can encap many protocols. The configuration below is ppp (simple configuration, for reference only)
Router1:
Hostname router1
Username router2 password xxx
Interface Serial0
Ip address 192.200.10.1 255.255.255.0
Clockrate 1000000
Ppp authentication chap
!
Router2:
Hostname router2
Username router1 password xxx
Interface Serial0
Ip address 192.200.10.2 255.255.255.0
Ppp authentication chap
2: 26xx password recovery is described on the cisco website. You can check it out)
Example of Password Recovery on a Cisco 2600
The following example shows password recovery on a Cisco 2600.
Router> en
Password:
Password:
Password:
% Bad secrets
Router> sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0 (7) T, release software (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
ROM: System Bootstrap, Version 11.3 (2) XA4, release software (fc1)
Router uptime is 3 minutes
System returned to ROM by abort at PC 0x802D0B60
System image file is "flash: c2600-is-mz.120-7.T"
Cisco 2611 (MPC860) processor (revision 0x202) with 26624 K/6144 K bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface (s)
2 Serial (sync/async) network interface (s)
1 ISDN Basic Rate interface (s)
32 K bytes of non-volatile configuration memory.
-- More -- 8192 K bytes of processor board System flash partition 1 (Read/Write)
8192 K bytes of processor board System flash partition 2 (Read/Write)
Configuration register is 0x2102
Router>
! --- The router was just powercycled and during bootup
! --- Break sequence was sent to the router.
!
*** System received an abort due to Break Key ***
Signal = 0x3, code = 0x500, context = 0x813ac158
PC = 0x802d0b60, Vector = 0x500, SP = 0x80006030
Rommon 1> confreg 0x2142
You must reset or power cycle for new config to take effect
Rommon 2> reset
System Bootstrap, Version 11.3 (2) XA4, release software (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
TAC: Home: SW: IOS: Specials for info
C2600 platform with 32768 Kbytes of main memory
Program load complete, entry point: 0x80008000, size: 0x6fdb4c
Self decompressing the image :###############################
######################################## ######################
######################################## ######################
######################################## ######################
############################### [OK]
Restricted Rights Legend
Use, duplication, or disclosure by the Government is
Subject to restrictions as set forth in subparagraph
(C) of the specified cial Computer Software-Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(C) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0 (7) T, release software (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
Cisco 2611 (MPC860) processor (revision 0x202) with 26624 K/6144 K bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface (s)
2 Serial (sync/async) network interface (s)
1 ISDN Basic Rate interface (s)
32 K bytes of non-volatile configuration memory.
8192 K bytes of processor board System flash partition 1 (Read/Write)
8192 K bytes of processor board System flash partition 2 (Read/Write)
--- System Configuration Dialog ---
Wocould you like to enter the initial configuration dialog? [Yes/no]: n
Press RETURN to get started!
00: 00: 19: % LINK-3-UPDOWN: Interface BRI0/0, changed state to up
00: 00: 19: % LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
00: 00: 19: % LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up
00: 00: 19: % LINK-3-UPDOWN: Interface Serial0/0, changed state to down
00: 00: 19: % LINK-3-UPDOWN: Interface Serial0/1, changed state to down
00: 00: 20: % LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0, changed state to down
00: 00: 20: % LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to up
Router>
00: 00: 20: % LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1, changed state to up
00: 00: 20: % LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
00: 00: 20: % LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
00: 00: 50: % SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0 (7) T, release software (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 by phanguye
00: 00: 50: % LINK-5-CHANGED: Interface BRI0/0, changed state to administratively down
00: 00: 52: % LINK-5-CHANGED: Interface Ethernet0/0, changed state to administratively down
00: 00: 52: % LINK-5-CHANGED: Interface Serial0/0, changed state to administratively down
00: 00: 52: % LINK-5-CHANGED: Interface Ethernet0/1, changed state to administratively down
00: 00: 52: % LINK-5-CHANGED: Interface Serial0/1, changed state to administratively down
00: 00: 53: % LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to down
00: 00: 53: % LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1, changed state to down
Router>
Router> en
Router # copy start run
Destination filename [running-config]?
1324 bytes copied in 2.35 secs (662 bytes/sec)
Router #
00: 01: 24: % LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0, changed state to down
00: 01: 24: % LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/, changed state to down
Router # conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router (config) # enable secret cisco
Router (config) # ^ Z
00: 01: 54:% SYS-5-CONFIG_ I: Configured from console by console
Router # sh ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 10.200.40.37 yes tftp administratively down
Serial0/0 unassigned yes tftp administratively down
BRI0/0 193.251.121.157 YES unset administratively down
BRI0/0:1 unassigned YES unset administratively down
BRI0/0: 2 unassigned YES unset administratively down
Ethernet0/1 unassigned yes tftp administratively down
Serial0/1 unassigned yes tftp administratively down
Loopback0 193.251.121.157 yes tftp up
Router # conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router (config) # int Ethernet0/0
Router (config-if) # no shut
Router (config-if )#
00: 02: 14: % LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
00: 02: 15: % LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to up
Router (config-if) # int BRI0/0
Router (config-if) # no shut
Router (config-if )#
00: 02: 26: % LINK-3-UPDOWN: Interface BRI0/0:1, changed state to down
00: 02: 26: % LINK-3-UPDOWN: Interface BRI0/0: 2, changed state to down
00: 02: 26: % LINK-3-UPDOWN: Interface BRI0/0, changed state to up
00: 02: 115964116991: % ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0, TEI 68 changed to up
Router (config-if) # ^ Z
Router #
00: 02: 35:% SYS-5-CONFIG_ I: Configured from console by console
Router # copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
Router # sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0 (7) T, release software (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
ROM: System Bootstrap, Version 11.3 (2) XA4, release software (fc1)
Router uptime is 3 minutes
System returned to ROM by abort at PC 0x802D0B60
System image file is "flash: c2600-is-mz.120-7.T"
Cisco 2611 (MPC860) processor (revision 0x202) with 26624 K/6144 K bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface (s)
2 Serial (sync/async) network interface (s)
1 ISDN Basic Rate interface (s)
32 K bytes of non-volatile configuration memory.
-- More -- 8192 K bytes of processor board System flash partition 1 (Read/Write)
8192 K bytes of processor board System flash partition 2 (Read/Write)
Configuration register is 0x2142
Router # conf t
Enter configuration commands, one per line. End with CNTL/Z.
The Router (config) # config-reg 0x2102
Router (config) # ^ Z
00: 03: 20:% SYS-5-CONFIG_ I: Configured from console by console
Router # sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0 (7) T, release software (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
ROM: System Bootstrap, Version 11.3 (2) XA4, release software (fc1)
Router uptime is 3 minutes
System returned to ROM by abort at PC 0x802D0B60
System image file is "flash: c2600-is-mz.120-7.T"
Cisco 2611 (MPC860) processor (revision 0x202) with 26624 K/6144 K bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface (s)
2 Serial (sync/async) network interface (s)
1 ISDN Basic Rate interface (s)
32 K bytes of non-volatile configuration memory.
-- More -- 8192 K bytes of processor board System flash partition 1 (Read/Write)
8192 K bytes of processor board System flash partition 2 (Read/Write)
Configuration register is 0x2142 (will be 0x2102 at next reload)
Router #