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Re: back interface command on point-to-point subinterface posted 08/13/2007
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Hi Alex,

You can make it work with Frame-Relay End-to-End Keepalives (see example below).

http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/products_feature_guide09186a0080087a58.html

HTH
Ben
******************
Router 1
******************
map-class frame-relay FREEK
frame-relay end-to-end keepalive mode bidirectional

interface Serial1/0
description TO FRAME
no ip address
encapsulation frame-relay
serial restart-delay 0
no frame-relay inverse-arp
!
interface Serial1/0.103 point-to-point
backup interface Serial1/1
ip address 172.16.103.1 255.255.255.0
logging event subif-link-status
frame-relay interface-dlci 103 class FREEK
!
interface Serial1/1
description TO R3
ip address 172.16.31.1 255.255.255.0
serial restart-delay 0


******************
Router 3
******************
map-class frame-relay FREEK
frame-relay end-to-end keepalive mode bidirectional

interface Serial1/0
no ip address
description TO FRAME
encapsulation frame-relay
serial restart-delay 0
no frame-relay inverse-arp
! interface Serial1/0.103 point-to-point
ip address 172.16.103.3 255.255.255.0
logging event subif-link-status
frame-relay interface-dlci 301 class FREEK
!
interface Serial1/2
ip address 172.16.31.3 255.255.255.0
description TO R1
serial restart-delay 0


Test it - On R3:
Rack1R3(config)#int s1/0.103 Rack1R3(config-subif)#frame-relay interface-dlci 301
Rack1R3(config-fr-dlci)#no class FREEK Rack1R3(config-fr-dlci)#no class FREEK


! wait for the keepalives to expire - R1:

*Mar 1 00:20:33.123: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0.103, changed state to down
*Mar 1 00:20:33.131: %FR_EEK-5-FAILED: Interface Serial1/0.103 - DLCI 103
Rack1R1#
*Mar 1 00:20:35.663: %LINK-3-UPDOWN: Interface Serial1/1, changed state to up
Rack1R1#
*Mar 1 00:20:36.667: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to up
Rack1R1#


R3:
*Mar 1 00:20:34.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up


Alex Steer wrote:
Hi group study



I am having some trouble getting the "backup interface" command to work
on a point-to-point sub interface.  Both interfaces have been tested to
confirm that they work and I have also tried the exact same command on
the main serial interface (that works).  I shutdown the point-to-point
subinterface and get the following:-



Interface             IP-Address      OK? Method Status
Protocol

Serial0/0                  unassigned      YES NVRAM  up
up

Serial0/0.401              148.1.0.4       YES NVRAM  administratively
down down

Serial0/1                  148.1.45.4      YES NVRAM  standby
mode/disabled down





It seems like a really simple task but I can't for the life of me get it
to work.  Has anybody got any suggestions that could help me please?



For completeness I have included the interface config though there is
only one line (please note the shutdown command has been added
intentionally to test the backup)



interface Serial0/0

no ip address

encapsulation frame-relay

no arp frame-relay

no frame-relay inverse-arp



interface Serial0/0.401 point-to-point

backup interface Serial0/1

ip address 148.1.0.4 255.255.255.0

shutdown



Many thanks in advance (I know someone is going to tell me that I
haven't turned the router on or something on this one)



I am trying this on a 3620 but have since tried (with the same problem
on a 7204)





Many thanks in advance



Alex





Cisco Internetwork Operating System Software

IOS (tm) 3600 Software (C3620-J1S3-M), Version 12.3(21), RELEASE
SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2006 by cisco Systems, Inc.

Compiled Mon 06-Nov-06 14:22 by ccai

Image text-base: 0x60008B00, data-base: 0x619E8000



ROM: System Bootstrap, Version 11.1(19)AA, EARLY DEPLOYMENT RELEASE
SOFTWARE (fc1)

ROM: 3600 Software (C3620-J1S3-M), Version 12.3(21), RELEASE SOFTWARE
(fc2)



Router4 uptime is 54 minutes

System returned to ROM by power-on

System image file is "slot0:c3620-j1s3-mz.123-21.bin"



cisco 3620 (R4700) processor (revision 0x81) with 61440K/4096K bytes of
memory.

Processor board ID 10130077

R4700 CPU at 80MHz, Implementation 33, Rev 1.0

Bridging software.

X.25 software, Version 3.0.0.

TN3270 Emulation software.

2 Ethernet/IEEE 802.3 interface(s)

1 Token Ring/IEEE 802.5 interface(s)

2 Serial network interface(s)

DRAM configuration is 32 bits wide with parity disabled.

29K bytes of non-volatile configuration memory.

16384K bytes of processor board System flash (Read/Write)

16384K bytes of processor board PCMCIA Slot0 flash (Device not
programmable)





Cisco IOS Software, 7200 Software (C7200-JK9S-M), Version 12.3(14)T7,
RELEASE SOFTWAR

E (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2006 by Cisco Systems, Inc.

Compiled Thu 23-Mar-06 04:43 by pwade



ROM: System Bootstrap, Version 12.1(20000914:181332) [bwhatley-npe200
102], DEVELOPME

NT SOFTWARE

BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(9), RELEASE SOFTWARE
(fc1)



Router6 uptime is 1 hour, 6 minutes

System returned to ROM by power-on

Running default software





This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.



A summary of U.S. laws governing Cisco cryptographic products may be
found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html



If you require further assistance please contact us by sending email to

export@xxxxxxxxxx



Cisco 7206 (NPE200) processor (revision B) with 114688K/16384K bytes of
memory.

Processor board ID 8770749

R5000 CPU at 200MHz, Implementation 35, Rev 2.1, 512KB L2 Cache

6 slot midplane, Version 1.3



Last reset from power-on



Number of Fast PAs = 2

Number of Fast+Medium PAs = 2

Total number of PA bandwidth points consumed = 500

Please refer to the following document "Cisco 7200 Series Port

Adaptor Hardware Configuration Guidelines" on CCO <www.cisco.com>,

for c7200 bandwidth points oversubscription/usage guidelines.



3 FastEthernet interfaces

4 Serial interfaces

125K bytes of NVRAM.

4096K bytes of packet SRAM memory.



46976K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).

4096K bytes of Flash internal SIMM (Sector size 256K).

Configuration register is 0x2102






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