From: Alejandro Cadarso (a.cadarso@xxxxxxxxxxxxxx)
Date: Thu Aug 24 2000 - 15:50:45 GMT-3
Hi
I'm trying to make a lab about OSPF, and I'm using a dedicated
connection between two routers with Async interfaces, emulating a leased
line:
interface Async1
ip address 192.19.18.1 255.255.255.0
no ip directed-broadcast
encapsulation ppp
async dynamic routing
async mode dedicated
My problem is that I've "No Hellos (Passive interface)"
2503-bar#sh ip ospf interface async1
Async1 is up, line protocol is up
Internet Address 192.19.18.1/24, Area 5
Process ID 5, Router ID 190.1.1.1, Network Type POINT_TO_POINT, Cost:
5263
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
No Hellos (Passive interface)
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
And obviously this doesn't allow to form the adjacency with the other
router,I tried to use the no version of the passive-interface command to
enable routing updates to be sent over this interface, even when I don't
put in my configuration "passive interface Async5", and it doesn't
appear in my conf.
because of this I suppose that IOS doesn't allow to form adjacencies in
ASYNC interfaces. am I correct?. in this case anybody knows Why?
Besides, looking for Information I've found in the CCO:
>Configuring a Simplex Ethernet or Serial Interface
>
>Because simplex interfaces between two devices on an Ethernet represent only o
ne network segment, for OSPF you must configure >the transmitting interface to
be a passive interface. This prevents OSPF from sending hello packets for the t
ransmitting >interface. Both devices are able to see each other via the hello p
acket generated for the receiving interface.
>
>This means that the suppression of sending hello packets is required on the sp
ecified interface. This is accomplished using >the following command:
>
>passive interface type number
>
>Note Why are they called simplex interfaces? Simplex means half duplex, and th
is means they typically have one transmitter. >However, the newer devices have
interfaces that allow full duplex, which means fewer collisions during transmis
sions. Most >interfaces default to simplex.
I can't understad "Simplex means half duplex", I never need to
configure passive interfaces for ethernet or Serial interfaces and
obviously everithing works fine.
any ideas about what means this information?
Regards,
Alejandro.
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