Source-Based Distribution Trees

Dense-mode routing protocols are suitable for dense topology in which there are many multicast group members relative to the total number of hosts in a network. When a PIM-DM router receives a multicast packet, it first performs the RPF check. If the RPF check succeeds, the router forwards a copy of...

MPLS Traffic Engineering

The first major deployment of RSVP technology came with Multiprotocol Label Switching (MPLS) traffic engineering (TE). MPLS traffic engineering automatically establishes and maintains label-switched paths (LSPs) across the backbone by using RSVP to establish and guarantee "tunnels" of predictable ba...

Implementing Banners

The following commands configure various types of banners on a router: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#banner exec  # This is an exec banner # Router1(config)#banner login # This is a login banner # Router1(co...

VLAN Trunks

At the access layer, end-user devices connect to switch ports that provide simple connectivity to a single VLAN each. The attached devices are unaware of any VLAN structure and simply attach to what appears to be a normal physical network segment. Remember, sending information from an access link on...

EIGRP Authentication Configuration Checklist

The EIGRP authentication configuration process requires several commands, which are summarized as follows: Step 1.    Create an (authentication) key chain: Create the chain and give it a name with the key chain name global command (also puts the user into key chain config mode). T...

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