From: Brian Dennis (brian@5g.net)
Date: Sat Oct 19 2002 - 19:10:36 GMT-3
Backup Interface Command Caveat:
When an interface (i.e. serial) is configured for backup and the
interface is administratively shutdown, the 'backup interface' (i.e.
BRI) will not come out of the standby state. To test the backup
interface command use one of the methods listed below:
1) Disconnect cable.
2) HDLC or PPP - Shutdown the side of the link that does not have the
backup interface command configured.
3) HDLC or PPP - Change the encapsulation on only one side to create an
encapsulation mismatch.
4) Frame-Relay Physical Interfaces - Shutdown the interface on
Frame-Relay switch that is connected to the router with the backup
interface command configured.
5) Frame-Relay Subinterfaces - Shutdown the subinterface on the side
without backup command configured.
Brian Dennis, CCIE #2210 (R&S/ISP Dial)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Peng Zheng
Sent: Saturday, October 19, 2002 1:32 PM
To: ccielab@groupstudy.com
Subject: Backup interface
I connect two 2520 though Serial and ISDN,
R1(s3)---------------(s1)R2
|(bri0) |(bri0)
|______________________|
I use crossover cable to connect serial port. R1 is
DCE, R2 is DTE.
Configuration on R1:
interface Serial3
ip address 192.168.100.1 255.255.255.0
no ip route-cache
no ip mroute-cache
clockrate 64000
!
interface BRI0
ip address 192.168.200.1 255.255.255.0
encapsulation ppp
no ip route-cache
no ip mroute-cache
dialer idle-timeout 180
dialer map ip 192.168.200.2 name R2 broadcast
4082222222
dialer load-threshold 1 either
dialer-group 1
isdn switch-type basic-ni
isdn spid1 40811111111 4081111111
isdn spid2 40811111112 4081111111
ppp authentication chap
ppp multilink
On R2:
interface Serial1
ip address 192.168.100.2 255.255.255.0
no ip route-cache
no ip mroute-cache
!
interface BRI0
ip address 192.168.200.2 255.255.255.0
encapsulation ppp
no ip route-cache
no ip mroute-cache
dialer idle-timeout 180
dialer map ip 192.168.200.1 name R1 broadcast
4081111111
dialer load-threshold 1 either
dialer-group 1
isdn switch-type basic-ni
isdn spid1 40822222221 4082222222
isdn spid2 40822222222 4082222222
ppp authentication chap
ppp multilink
I can ping each other through both link.
Then I added backup interface bri 0 under s1 of R2.
Then I got:
R2# sh isdn stat
Global ISDN Switchtype = basic-ni
ISDN BRI0 interface
dsl 0, interface ISDN Switchtype = basic-ni
Layer 1 Status:
DEACTIVATED
Layer 2 Status:
Layer 2 NOT Activated
TEI Not Assigned, ces = 1, state = 1(terminal
down)
spid1 configured, spid1 NOT sent, spid1
NOT valid
TEI Not Assigned, ces = 2, state = 5(init)
spid2 configured, spid2 NOT sent, spid2
NOT valid
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Total Allocated ISDN CCBs = 0
When I shutdown the s1 of R2, nothing happened.
What's the problem?
Thank you for help.
Best Wishes,
Peng Zheng
This archive was generated by hypermail 2.1.4 : Tue Nov 05 2002 - 08:35:51 GMT-3