Multihoming Scenario: Addresses Taken from Different Providers
One possibility for large domains is to take IP addresses from different providers based on geographic location. Consider Figure 3-16. Largenet has taken its IP addresses from two different providers, ISP1 and ISP2. With this design, each provider will be able to aggregate its own address space without having to list specific ranges from the other provider. ISP1 would advertise the aggregate 198.24.0.0/13, and ISP2 would advertise the aggregate 198.32.0.0/13. Both aggregates ..
WAN Edge Classification and Provisioning Models
One of the most common questions raised when planning a QoS deployment over the WAN is "How many classes of traffic should be provisioned for?" The following considerations should be kept in mind when arriving at an appropriate traffic class model for a given enterprise. Slow/Medium Link-Speed QoS Class Models Slow-speed ( 768 kbps) links have very little bandwidth to carve up, to begin with. When the serialization implications of sending Interactive-Video into the LL..
VMPS and Dynamic VLANs: Advanced Administration
Normally, when you configure a VLAN, you must perform three steps: 1. Ensure that the Catalyst belongs to a VTP domain 2. Create a VLAN 3. Assign ports to the VLAN The first two steps globally affect Catalysts. When you create a VLAN, VTP announces the addition or deletion of the VLAN throughout the VTP domain. Assigning ports to a VLAN, however, is a local event. VTP does not announce what ports belong to which VLAN. Yo..
There are several useful commands for checking the status of multicast configuration and protocols. You can see what multicast routes pass through a router with the EXEC command: Router#show ip mroute There are two useful variants of this command. The first reports on forwarding statistics for each multicast group: Router#show ip mroute count And the second reports only on the groups that are currently active: Router#show ip mroute active You can look at statistics on ..
Route summarization works best when the subnet planning process considers route summarization. To accommodate summarization, the engineer assigning subnets can assign larger address blocks to one part of the topology. The engineers working with that part of the internetwork can break the address blocks into individual subnets as needed. At the edge of that part of the network, the engineers can configure route summaries to be advertised to the other parts of the internetwork...
