When you start MPLS on the first interface in a router, the TDP/LDP process is started and the Label Information Base (LIB) structure is created. The router also tries to discover other LSRs on the interfaces running MPLS through TDP hello packets. The TDP hello packets are sent as broadcast or multicast UDP packets, making LSR neighbor discovery automatic. The debug tag tdp transport command can monitor the TDP hellos. Example C-4 shows the TDP process startup and Example C-..
Traffic-Shaping Adaptation on Frame Relay Networks
A shaper used with Frame Relay can be configured to vary the shaping rate over time based on the presence or absence of congestion. When there is no congestion, the shaper uses the shaping rate,but when congestion occurs, it lowers the shaping rate, eventually reaching a minimum shaping rate. The minimum rate can be configured, or default to 50 percent of the shaping rate. This lower rate is typically called either the minimum information rate (MIR) or the mincir. To lower t..
Setting the IP Source Address for Syslog Messages
Use the logging source-interface configuration command to specify a particular IP address for syslog messages: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#logging host 172.25.1.1 Router(config)#logging source-interface Loopback0 Router(config)#end Router# Normally, when you enable logging to a remote server, that server will see the source of the message as being the router's nearest interface. However, this is..
Requirements for PPP over Frame Relay
The Request for Comments (RFC) document number 1661 (known as RFC 1661) outlines PPP as an industry standard protocol that supports router-to-router or host-to-network connections between point-to-point links. As a successor to the Serial Line Internet Protocol (SLIP), PPP was designed to work with several different network layer protocols, such as IP, IPX, and SNA. Unlike PPP, the legacy SLIP only supports IP. PPP has added security features, such as Challenge Handshake Aut..
Sometimes you need to connect your network to another network that uses an unregistered range, such as 172.16.0.0/16. However, if you already use this range in your network, the easiest thing to do is to simply replace this prefix with another one that doesn't have a conflict, such as 172.17.0.0/16: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ip nat outside source static network 172.16.0.0 172.17.0.0 /16 no-al..
