FAQ-How Is the Traffic on the ARx9 Router Automatically Switched from the Faulty BGP Primary Link to the ADSL Backup Link Through NQA

Publication Date:  2012-07-27 Views:  200 Downloads:  0
Issue Description
 Q:
As required by the customer, the AR router needs to track and detect the BGP primary link so that traffic is automatically switched from the faulty BGP primary link to the ADSL or ADSL2+ backup PPPoE link. When the BGP link recovers, the router switches the traffic back to the BGP link and cuts the ADSL link automatically.
For details about the customer’s requirements and networking diagram, see the attachment "Description of the NQA Application Scenario." 

 
Alarm Information
 Null 

 
Handling Process
 A:
The major configurations of NQA are listed below. For the complete configurations of NQA, see the appendix NQA config.txt. Through these configurations, the AR router can track and detect the BGP primary route so that traffic is automatically switched from the faulty BGP primary link to the ADSL or ADSL2+ backup PPPoE link. When the BGP link recovers, the router switches the traffic back to the BGP link and cuts the ADSL link automatically.
1. Configure NQA.
nqa server enable
nqa entry admintest
type icmp-echo
destination ip 20.20.20.1
frequency 1000
reaction 1 checked-element probe-fail threshold-type consecutive 5 action-type trigger-only
nqa schedule admintest start-time now lifetime forever
track 1 nqa entry admintest reaction 1
2. Configure ADSL-related interfaces.
interface Atm2/0
adsl standard t1413
interface Atm2/0.1
pvc 8/81
map bridge Virtual-Ethernet 1
interface Virtual-Ethernet1
pppoe-client dial-bundle-number 1
interface Dialer1
link-protocol ppp
ppp pap local-user sucursal3@respinet.com password simple sucursal3
mtu 1492
ip address 192.168.11.1 255.255.255.0
dialer user CENTRAL
dialer-group 1
dialer bundle 1
standby track 1
3. Configure static route tracking and set different priorities for the routes.
ip route-static 5.10.1.0 255.255.255.0 192.168.100.9 track 1 preference 5
ip route-static 5.10.1.0 255.255.255.0 192.168.11.254 preference 8 

 
Root Cause
 Null 

 
Suggestions
 Null 

 

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