Hi All,
Will greatly appreciate if somebody could throw some light on the issues
given below.
Some questions that have been haunting me for quiet some time.
The questions are -
1. In a Frame-Relay network, If a router interface / sub-interface is
configured as "point-multipoint". I have noticed that the DLCI address is not mentioned. Does it mean that
the FRAD will recieve information on the local as well as remote DLCI
information on its associated PVC's using the LMI interface. Also in a hub
& spoke topology wherein multiple branch offices are connected to the
central office, Could a single interface on the central office router be
associated with multiple PVC's to the branch offices, wherein the
interface would be configured in multipoint mode.
2. Why are "point-point" interfaces configured explicitedly with the local DLCI address. Why is
it so?
3. On a point-Multipoint interface with connections to more than one
destination, How does the OSPF adjacency form. Is it similar to a
broadcast interface, wherein after the InARP process, hello packets are
replicated to the respective remote IP addresses of the remote routers,
which are discovered through the InARP process.
4. I have heard that OSPF neighbors have to be configured manually in an
NBMA network. How is this network different from using Frame-Relay in
either point-point or point-multipoint mode.
5. I know that DLCI's have only local significance, Now in a large
Frame-Relay network, For e.g. Customer 1 is associated with a local DLCI
number 1 conected to Frame-Relay switch 1. Now if the other end of the PVC
is numbered as follows DLCI number 2 connected to Frame-Relay switch 2.
Now assume the connection between Frame-Relay switch 1 & 2 is via another
switch called 3. If switch 3 has a DLCI associated with it called 2. What
would happen if switch 1 is forwarding traffic destined to remote DLCI 2
which belongs to switch 2. Now since switch 3 is the transit point, What
would happen when the traffic reaches switch 3, Will it forward it to its
locally associated DLCI 2 or will it pass it on to the switch 2 which is
the actual destination.
6. I understand that many FR switches support layer 2 routing, Now FR
switching is based on static entries such as "Incoming port / Incoming
DLCI switched to Outgoing port / Outgoing DLCI". Now if a particular path
connected to outgoing port, How will the switch reroute the traffic, Just
trying to associate the switching technique to normal routing, where
rerouting is only possible in the case of Dynamic routing, & not static
tables.
Kindly provide your advice.
Thanks & warm regards,
Vinod.
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