02-22-2008 11:17 AM - edited 03-03-2019 08:50 PM
Hi all,
I would like to know what are the differences and benefits of using this configuration on a fr interface?
When I should use this one ?
interface Serial0/1/0
ip address 10.18.251.74 255.255.255.252
encapsulation frame-relay IETF
frame-relay interface-dlci 16
frame-relay lmi-type cisco
OR use this one?
interface Serial0/1/0
description Circuito xxxx
no ip address
encapsulation frame-relay IETF
no ip mroute-cache
load-interval 30
serial restart-delay 0
frame-relay lmi-type cisco
!
interface Serial0/0/1.16 point-to-point
description Conexion ISP
bandwidth 1920
ip address 10.18.251.74 255.255.255.252
ip verify unicast reverse-path
no ip redirects
no ip unreachables
no ip proxy-arp
ip virtual-reassembly
frame-relay interface-dlci 16 IETF
What are the benefits?
Thanks
Regards
Lp
02-22-2008 11:35 AM
Hi,
On the main interface you could have Multiple VCs connected to the same hub.
In a point-to-point frame-relay, you just limiting it to one PVC between two DTEs.
HTH
Mohamed
02-22-2008 12:33 PM
Lp
I would like to add a little to the answer given by Mohamed. Your first configuration which uses the physical interface is inherently a multipoint Frame Relay connection - even if there is only a single PVC it will be treated as multipoint. Your second configuration is explicitly a point to point Frame Relay interface. Which one you should use will depend on some aspects of the design of your network. If the design is for multipoint then the first configuration is what to use and if the design is for point to point then the second configuration is the one to use.
Beyond the fact that there might be several PVCs or only a single PVC there are some differences in how the two configurations will work. In a multipoint interface there will be some Frame Relay mapping which may be manually configured or the IOS can dynamically discover it. In multipoint all the interface addresses on all the routers on the PVCs will be in a single subnet. In point to point each PVC will be a unique subnet.
The operation of routing protocols may be a bit different depending on whether the interface is multipoint or point to point. OSPF establishes neighbor relationships differently depending on whether it is multipoint or point to point. EIGRP enforces split horizon on multipoint which is not a factor in point to point.
HTH
Rick
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