Using Metrics and Metric Types to Influence Redistributed Routes

A different set of issues can occur for a router that is internal to a single routing domain, like R4and R5 in Figure 11-4. The issue is simple—with multiple redistributing routers, an internal routerlearns multiple routes to the same subnet, so it must pick the best route. As covered earlier in thechapter, the redistributing routers can set the metrics; by setting those metrics with meaningfulvalues, the internal routers can be influenced to use a particular redistribution..

Data Transfer

The exchange of data in an 802.11 network is bidirectional between the radio card and access point. As mentioned earlier, data frames in an infrastructure wireless LAN do not travel directly between wireless users. Instead, the access point relays the data. A radio card or access point (802.11 station) having the destination MAC address of the data frame replies with an acknowledgement (ACK) frame. This adds significant overhead to a wireless LAN as compared to an Ethernet n..

Configuring TCP/IP Header Compression over Frame Relay

This section discusses the TCP/IP header compression scheme for Frame Relay virtual circuits. TCP/IP header compression is also commonly known as the Van Jacobson's algorithm, designed and defined in RFC 1144. The TCP/IP header compression scheme relies on the redundant nature of many fields within the TCP/IP headers of a packet after a connection has been established. For the entire duration of the TCP session, the header details for the connection are maintained at both the..

QoS over MPLS

For this example, we will take a relatively simple view that the PE router will trust the CE router's DSCP/IP Precedence settings and map them to the MPLS EXP traffic priority field in a simple way. So we will focus on the configuration required on the PE and P routers to make use of this information. First, the PE routers have the dual function of converting DSCP or IP Precedence values to MPLS EXP values and then using this information appropriately when forwarding the pac..

Configuring Multiple DHCP Servers per Subnet

You can configure multiple routers to act as DHCP servers for a single subnet, by ensuring that they don't use the same pool of addresses. Here's Router1: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#ip dhcp pool 172.22.1.0/24 Router1(dhcp-config)#network 172.22.1.0 255.255.255.0 Router1(dhcp-config)#default-router 172.22.1.1 Router1(dhcp-config)#domain-name oreilly.com Router1(dhcp-config)#dns-server ..