Enabling RIP and the Effects of Autosummarization
Example 8-4 covers basic RIP configuration, the meaning and implication of the RIP network command, and the effects of the default setting for autosummarization. To examine just those functions, Example 8-4 shows the related RIP configuration on R1, R2, and R6, along with some command output. Example 8-4 Basic RIP Configuration on R1, R2, R4, and S1 A couple of points from this example need a little more explanation. The RIP network command only allows for a classful..
Complete sequence number PDU (CSNP) has a fixed header with TLV appended. Each of these TLVs represents an LSP in the link-state database. The following summary information is carried regarding each LSP: The LSP ID The sequence number The LSP checksum The remaining lifetime CSNP is like a database description packet, as in OSPF. Because IS-IS does not have difficulty with synchronization, as OSPF does, the DIS sends a CSNP every 10 seconds o..
IGMPv1 Unsolicited Host Membership Report
In IGMPv1, a multicast router sends IGMP Host Membership Query messages by default every 60 seconds (Query Interval) on each of its LAN interfaces to determine whether any host wants to receive multicast traffic for any group. However, a host does not have to receive the Host Membership Query message from the router to send a Host Membership Report. A host can send an IGMPv1 Unsolicited Host Membership Report anytime a user launches a multicast application. This feature redu..
Cisco IOS provides a wide variety of queuing tools. The upcoming sections of this chapter describe several different IOS queuing tools, with a brief summary ending the section on queuing. Table 15-2 summarizes the main characteristics of different queuing tools that you will want to keep in mind while comparing each successive queuing tool. Table 15-2 Key Comparison Points for Queuing Tools
Chapter 2 discusses the differences between a bridge and a switch. Cisco identifies the Catalyst as a LAN switch; a switch is a more complex bridge. The switch can be configured to behave as multiple bridges by defining internal virtual bridges (i.e., VLANs). Each virtual bridge defines a new broadcast domain because no internal connection exists between them. Broadcasts for one virtual bridge are not seen by any other. Only routers (either external or internal) should connec..
