When the the ISDN interface BRI0/0 is not on call the router shows "BRI0/0 is up (spoofing), line protocol is up (spoofing)".
I know this is needed for IP to see the interface viable.
But when the call is estabilished and the router says "BRI0/0 is up, line protocol is up (spoofing)", why the line protocol is still spoofing?
Or customer problem is that NetView 6000 snmp network management station shows the interfaces BRI0/0 in a state of "dormient" and B-channels BRI0/0:1 and BRI0/0:2 "dormient" when there is non call and UP when the call is estabilished.
The fact is that the BRI0/0 remains always "dormient" and the color of the interface does not change to alert the operator that the iSDN is UP.
I am not in charge for the NetView management station, but can someone help me to give an answer to the customer?
Re: ISDN BRI (spoofing) and NetView snmp (dormient)
After the interesting packets are defined, they must be routed properly for a call to be initiated. The routing process depends on two things: routing table entries and an "up" interface over which to route packets. In order for packets to be routed to and through an interface, that interface must be up/up as seen in a show interfaces output:
router# show interfaces ethernet 0
Ethernet0 is up, line protocol is up
Hardware is Lance, address is . . .
What happens to a dialer interface that is not connected? If protocol is not up and running on the interface, the implication is that the interface itself will not be up. Routes which rely on that interface will be flushed from the routing table, and traffic will not be routed to that interface. The result is that no calls would be initiated by the interface.
The solution to counter this possibility is to allow the state up/up (spoofing) for dialer interfaces. Any interface can be configured as a dialer interface. For example, a Serial or Async interface could be made into a dialer by adding the command dialer in-band or dialer dtr to the interface's configuration. These lines are unnecessary for interfaces that are by nature a dialer interface (BRIs and PRIs). The output for a show interface will look like this:
router# show interfaces bri 0
BRI0 is up, line protocol is up (spoofing)
Hardware is BRI
Internet address is . . .
In other words, the interface "pretends" to be up/up so that associated routes will remain in force and so that packets can be routed to the interface.
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