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Registration Services

The NIS manager was required to act in accordance with RFC 1174, which states the following: The Internet system has employed a central Internet Assigned Numbers Authority (IANA)[] for the allocation and assignment of various numeric identifiers needed for the operation of the Internet. The IANA function is performed by the University of Southern California's Information Sciences Institute. The IANA has the discretionary authority to delegate portions of this responsibility ..

Multicast Routing Protocols

Multicast differs from simple broadcast in the sense that it only attempts to deliver a packet to interested users. It differs from unicast or pointcast in that only one copy of a packet travels over any link. For large-scale applications, this can represent a huge reduction in the use of bandwidth and switching capacity.   The characteristics of multicast routing are well suited to conferencing applications, but these are by no means the only applications. Multic..

LDP GR Mechanism for Downstream Unsolicited Mode

The LDP GR mechanism specifies protocol extensions that enable an LSR to express to an LDP peer its capability to preserve an MPLS forwarding state across the LDP control-plane component restart and the estimated time that it would take to restart the LSR to reestablish the LDP session with the peer. Afterward, when the LDP control-plane component of the LSR restarts, the restarting LSR loses its LDP session with the peers. On detecting that its LDP session with a neighbor ha..

Viewing Frame Relay Status Information

There are several useful show commands for looking at Frame Relay circuits and virtual circuits. It is usually best to start at the physical layer and work upward through the protocol layers. You can look at the physical interface with the show interfaces command: Central#show interfaces Serial0 The show frame-relay pvc command allows you to see information about each of your Frame Relay PVCs: Central#show frame-relay pvc And sometimes it is also useful to look at the LM..

PE-CE Communication via EIGRP

The solution to this problem is similar to the RIP solution. First we have to enable the routing protocol on the CE routers, which we do in the usual way: Router-CE-A1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router-CE-A1(config)#router eigrp 156 Router-CE-A1(config-router)#network 192.168.1.0 Router-CE-A1(config-router)#network 192.168.5.0 Router-CE-A1(config-router)#no auto-summary Router-CE-A1(config-router)#end Router-C..

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