1701. The show isis database Command
The show isis database command shows the LSPs held in the local database. The LSP ID shows the system ID of the generating router and whether this LSP is from a router or a pseudonode. The last octet shows whether the LSP was too large to fit into one PDU; a nonzero value in this field indicates that this is a fragment of an LSP (the next number states the fragment number). Because IS-IS is a link-state protocol, the database should be identical on every router of the ..
Routing Policy and the BGP Decision Algorithm
A BGP router may receive paths for the same route from many neighbors. How the best path is selected is a matter of local policy. The policy within an AS must be consistent; otherwise, routing loops could occur. Conceptually, the policy and decision process is shown in Figure 11-16. Figure 11-16. BGP's Policy and Decision Process An incoming Routing Information Base is maintained for each peer. Incoming policy is applied to each RIB, and complying routes are p..
Configuring CBWFQ for Frame Relay
This section discusses the configuration tasks for enabling CBWFQ on Frame Relay PVCs. CBWFQ is configured via the MQC configuration interface; MQC was explained at the beginning of this chapter. Table 18-1 lists the configuration options available for setting up the traffic classes. Table 18-2 displays the class policy configurations available. Table 18-1. Available Options for Setting Up the Traffic Class (class-map) Command (config-cmap) ..
Summarizing Outbound Routing Information
By default, BGP will try to summarize routes. This is not always desirable, though, which is why we have explicitly disabled this feature in many of the examples in this chapter. In fact, many engineers prefer to manually summarize their routing tables because they want to control what gets summarized and what doesn't. The first problem with auto-summarization is that it is strictly classful. Your AS may not control all of the subnets in a classful network, and even if you d..
The IEEE 802.1Q protocol also can carry VLAN associations over trunk links. However, this frame-identification method is standardized, allowing VLAN trunks to exist and operate between equipment from multiple vendors. In particular, the IEEE 802.1Q standard defines an architecture for VLAN use, services provided with VLANs, and protocols and algorithms used to provide VLAN services. You can find further information about the 802.1Q standard at http://grouper.ieee.org/groups/ ..
