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New Member

nBar on 1700 router

I am running ADSL on a 1700 router and trying to implement some application monitoring with Highlight. If I monitor the ethernet interface I can see all the in/out traffic without problems but when I try the same for the adsl interface I get mixed results. If I monitor on atm0 i get no data at all, if I monitor the dialer interface i get inbound data only and i can not get any stats for the atm sub-interfaces at all (even with nBar configured on them). Here is the config:

urrent configuration : 8950 bytes



version 12.3

service nagle

no service pad

service tcp-keepalives-in

service tcp-keepalives-out

service timestamps debug datetime msec localtime show-timezone

service timestamps log datetime msec localtime show-timezone

service password-encryption

service linenumber


hostname xxxxxxxxxxxxxxxxxxx





logging buffered 16384 debugging

logging console emergencies


clock summer-time BST recurring last Sun Mar 1:00 last Sun Oct 1:00

mmi polling-interval 60

no mmi auto-configure

no mmi pvc

mmi snmp-timeout 180

ip subnet-zero

no ip source-route



ip tcp window-size 65496

ip tftp source-interface Loopback0

no ip domain lookup

no ip bootp server

ip cef


interface Loopback0

description Monitoring and Management

ip address xxxxxxxxxxxxxxxxxxxxxxx


interface ATM0

description xxxxxxxxxx

no ip address

ip nbar protocol-discovery

snmp ifindex persist

no atm ilmi-keepalive

dsl operating-mode auto


interface ATM0.1 point-to-point

ip nbar protocol-discovery

pvc DATA 0/38

encapsulation aal5mux ppp dialer

dialer pool-member 1



interface FastEthernet0

description xxxxxxxxxxxxxxxxxx

ip address xxxxxxxxxxxxxxxx

ip helper-address xxxxxxxxxxxx

no ip redirects

no ip unreachables

no ip proxy-arp

ip nbar protocol-discovery

ip tcp adjust-mss 1400

speed auto

no cdp enable


interface Dialer1

description xxxxxxxxxxxxxxxxxxx

mtu 1450

ip address xxxxxxxxxxxxxxxxxxxx

no ip proxy-arp

ip nbar protocol-discovery

ip rip advertise 15

encapsulation ppp

ip tcp adjust-mss 1400

dialer pool 1

no peer default ip address

no cdp enable

ppp max-bad-auth 3

ppp authentication chap xxxxxxxxxxx

ppp multilink


ip classless

ip route Dialer2 200

no ip http server



ip radius source-interface Loopback0


no cdp run


Re: nBar on 1700 router

I believe nbar is a qos mechanism and not monitoring mechanism.

New Member

Re: nBar on 1700 router

are you trying to monitor with snmp?


Re: nBar on 1700 router

Since NBAR is an IP based technology I will not expect it to work on an interface that does not have routing enabled (it does not have an ip address). I will think that NBAR should be enabled on the dialer interface then.

As not having outbound traffic, I noticed that your default route points to dialer 2, which I did not find in your config. Is dialer the outbound interface from your route table, or is it going out through another interface? If another interface is the outbound interface, then you will not notice any outbound traffic from NBAR.

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