TAILIEUCHUNG - A point-to-point subinterface can only accommodate

A point-to-point subinterface can only accommodate a single DLCI at any given time. Point-topoint sub-interfaces are treated by the IOS like a physical point-to-point interface and do not need either inverse-arp or frame-relay map statements. | FRAME-RELAY J A point-to-point subinterface can only accommodate a single DLCI at any given time. Point-to-point sub-interfaces are treated by the IOS like a physical point-to-point interface and do not need either inverse-arp or frame-relay map statements. J Multipoint DLCI s rely on either inverse-arp or frame-relay map statements for proper operation. J You must manually clear inverse-arp with a clear frame-inarp command to remove any undesired inverse-arp entries. J The broadcast parameter is required for protocols such as OSPF J If the router is reloaded inverse-arp will be disabled for any DLCI that is used with a frame-relay map statement. J As a rule when configuring frame-relay map statements make note of the protocol and the DLCI specified if there are any inverse mappings for that same protocol referencing the same DLCI replace the inverse-arp entries with frame-relay map statements. J Rules to remember when configuring point-to-point sub-interfaces are o No frame-relay map statements can be used with point-to-point sub-interfaces o One and only once DLCI can be associated with a single point-to-point interfaces J Without the frame-relay interface DLCI command all DLCI s are assigned to the physical interface J Split horizon only blocks routing updates in a hub and spoke topology J A Cisco IOS remedy to this split horizon problem is to disable split horizon on the hub router in a frame-relay network this can be performed at the interface configuration mode. J Split horizon is disabled on frame-relay physical IP interfaces split horizon is enabled on framerelay point-to-point and multi-point IP sub-interfaces. J OSPF is not affected by the rule of split horizon since it does not apply it. J A remedy to the problem of hello mismatches is using the Cisco IOS interface configuration command IP OSPF network J A popular selection for OSPF networks is the point-to-multipoint option J When using only physical interfaces in a hub and spoke topology you need to .

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