Configuring MED: Multiple Adjacent Autonomous Systems
By default, a Cisco router ignores MED when the multiple routes to a single NLRI list different neighboring ASNs. This default action makes sense—normally you would not expect two different neighboring ISPs to have chosen to work together to set MEDs. To override this default and consider the MED in all cases, a router needs to configure the bgp always-compare-med BGP subcommand. If used on one router, all routers inside the same AS should also use the bgp always-compare-me..
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-..
NLSP is a link state interior gateway protocol for IPX networks. NLSP, which is based on the OSI Intermediate System-to-Intermediate System (IS-IS) protocol, has features similar to those of other link state protocols, such as OSPF. Like other link state protocols, NLSP supports hierarchical addressing and fast convergence. NLSP has the capability to use hierarchical routing techniques to aggregate and summarize IPX network numbers. Route aggregation and summarization are us..
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE ..
Converting Ethernet and Token Ring MAC Addresses
The Perl script in Example 15-1 converts Ethernet addresses to the way they will appear when connected through a bridge to a Token Ring. It also performs the reverse translation of Token Ring addresses to Ethernet, which is identical. Example 15-1. eth-tok-mac.pl #!/usr/local/bin/perl # # eth-tok-mac.pl -- a script to convert Ethernet to Token Ring MAC # addresse..
