Default, Primary, and Backup, Plus Partial Routing
The addition of partial routing to the environment introduced in the previous discussionchanges the outbound traffic behavior. Figure 7-15 illustrates the new situation. The customercan accept partial routing from one or both providers. In addition, the customer must accept orconfigure default toward both providers, with one default preferred over the other. Figure 7-15. Multihoming to Two Providers Plus Partial Routing By accepting partial routing from the providers,..
Topology Change Notification and Updating the CAM
When STP reconvergence occurs, some Content Addressable Memory (CAM) entries might be invalid (CAM is the Cisco term for what’s more generically called the MAC address table, switching table, or bridging table on a switch). For instance, before the link failure shown in Figure 3-3, SW3’s CAM might have had an entry for 0200.1111.1111 (Router1’s MAC address) pointing out fa0/4 to SW4. (Remember, at the beginning of the scenario described in Figure 3-3, SW3 was blocking o..
Just as the Internet hierarchy had to adapt to accommodate an increase in players, so has the enterprise network. Early data networks facilitated the basic requirement of communication between terminals and a central mainframe. The need for a simple hierarchy, from terminal to IBM cluster controllers to front -end processors, was readily apparent from this basic requirement. In today's world of peer-to-peer networking, however, the reasons for network hierarchy and its inner ..
VoIP deployments require the provisioning of explicit priority servicing for VoIP (bearer stream) traffic and a guaranteed bandwidth service for Call-Signaling traffic. These related classes are examined separately. Voice (Bearer Traffic) The following list summarizes the key QoS requirements and recommendations for voice (bearer traffic): • Voice traffic should be marked to DSCP EF per the QoS Baseline and RFC 3246. • Loss should be ..
The following commands configure EIGRP on one router in a simple network: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Ethernet0 Router1(config-if)#ip address 192.168.20.1 255.255.255.0 Router1(config-if)#exit Router1(config)#interface Serial0.1 point-to-point Router1(config-subif)#ip address 172.25.2.2 255.255.255.252 Router1(config-subif)#exit Router1(config)#router eigrp 55 Router1(config-router)#n..
