Mutual Redistribution at Multiple Routers
When multiple routers redistribute between the same two routing protocol domains, several potentialproblems can occur. One type of problem occurs on the redistributing routers, because thoserouters will learn a route to most subnets via both routing protocols. That router uses the AD todetermine the best route when comparing the best routes from each of the two routing protocols;this typically results in some routes using suboptimal paths. For example, Figure 11-4 shows asamp..
The goal of EIGRP is to solve the scaling limitations that IGRP faces, while keeping the advantages of distance vector routing protocols: simplicity, economy of memory, and economy of processor resources. EIGRP is scalable in terms of hardware resources and network capacity. EIGRP is also lightning fast. Cisco identifies four principal components of EIGRP: • Protocol-dependent modules— EIGRP supports several routed protocols independently. The two that are of interest to..
Figure 18-3 extends the discussion in the previous section to present a conceptual diagram of the Catalyst 6000 Native IOS Mode. Figure 18-3. Conceptual Diagram of the MSFC Native IOS Mode In Figure 18-3, the Gigabit Ethernet ports on the Supervisor (1/1 and 1/2) have been configured as fully routed interfaces. Slot 5 contains a Fast Ethernet line card. Ports 5/1–5/3 have been configured as Layer 2 switchports in VLAN 2. Ports 5/4–5/6 have been configured as..
Many router commands will accept a hostname in place of an IP address. This helps make the configuration files more readable because it is much easier for humans to work with device names than IP addresses. However, the router still needs to have a way of translating these names into the IP addresses that it prefers to work with. Cisco supports two methods for resolving hostnames into IP addresses. You can either use static host entries, as we do in this recipe, or DNS, as we..
In 802.1D, each switch port is assigned a role and a state at any given time. Depending on the ports proximity to the Root Bridge, it takes on one of the following roles: ■ Root port ■ Designated port ■ Blocking port (neither root nor designated) The Cisco-proprietary UplinkFast feature also reserved a hidden alternate port role for ports that offered parallel paths to the root but were in the Blocking state. Recall that each switch port also is assigned one of f..
