Route Filtering with Distribute Lists and Prefix Lists
Outbound and inbound RIP updates can be filtered at any interface, or for the entire RIP process. To filter the routes, the distribute-list command is used under router rip, referencing an IP ACL or an IP prefix list. Any subnets matched with a permit clause in the ACL make it through; any that match with a deny action are filtered. The distribution list filtering can be performed for either direction of flow (in or out) and, optionally, for a particular interface. If the int..
Distance vector protocols are protocols that solely depend on neighbor routing advertisements to determine the best path to a destination. The advantage of the distance vector protocols is their simplicity to implement. However, because of the long convergence time, IGRP is not suitable for large networks. IGRP and RIP are both classical distance vector protocols. Although IGRP and RIP differ in metric calculation update timers, they exhibit the same behavior when it comes to..
The IETF IS-IS restart mechanism extends the IS-IS protocol and requires that both the restarting router and its neighbors be able to support these capabilities. In contrast, the Cisco IS-IS restart mechanism does not make any externally observable protocol changes. That is, the IS-IS restart on a router is hidden from its neighbors. First, this mechanism requires transmission of IIH packets quickly following the restart before an adjacency's hold time expires. Second, to con..
The first version sends all packets destined to the single host 10.35.15.5 out through the Ethernet0 interface. In this case, the router will need to figure out which device on this segment to forward the packet to, because it must put the MAC address of the next hop router in the Layer 2 frame header. The standard mechanism for associating IP addresses with MAC addresses is the Address Resolution Protocol (ARP). The router will send out an ARP request onto the Ethernet segme..
You also can assign a specific link mode to Ethernet-based switch ports. Therefore, the port operates in half-duplex, full-duplex, or autonegotiated mode. Autonegotiation is allowed only on UTP Fast Ethernet and Gigabit Ethernet ports. In this mode, the port participates in a negotiation by attempting full-duplex operation first and then halfduplex operation if full duplex is not successful. The autonegotiation process repeats whenever the link status changes. Be sure to set..
