The Very High-Speed Backbone Network Service

The very high-speed Backbone Network Service (vBNS)[] project was created to provide a specialized backbone service for the high-performance computing users of the major government-supported SuperComputer Centers (SCCs) and for the research community. On April 24, 1995, MCI and NSF announced the launch of the vBNS. MCI's duties include the following: • Establish and maintain a 155 Mbps or higher transit network that switches IP and CLNP and connects to all NSFNET-funded NA..

Sources Sending Packets to the Rendezvous Point

PIM-SM uses a two-step process to initially deliver multicast packets from a particular source to the hosts wanting to receive packets. Later, the process is improved beyond these initial steps. The steps for the initial forwarding of multicasts with PIM-SM are as follows: 1. Sources send the packets to a router called the rendezvous point (RP). 2. The RP sends the multicast packets to all routers/hosts that have registered to receive packets for that group. This process uses..

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..

Creating Exception Dump Files

This is the one recipe in this book that we hope none of our readers ever need to use. The main reason for creating an exception dump of your router memory contents is to help Cisco's TAC in diagnosing catastrophic software problems with one of your routers. When you have these types of extreme problems, however, the TAC will often ask to do an exception dump on the router. So we have included this recipe so that you'll know what to do if it ever becomes necessary. An excepti..

Connecting to Two ISPs

The following configuration shows how to make the basic BGP connections, but it has serious problems that we will show how to fix in other recipes in this chapter: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#interface Serial0 Router1(config-if)#description connection to ISP #1, ASN 65510 Router1(config-if)#ip address 192.168.1.6 255.255.255.252 Router1(config-if)#exit Router1(config)#interface Serial1 Router1(..