Frame Relay and ATM support a single bit that can be set for QoS purposes, but these single bits are intended for a very strict use related to drop probability. Frames or cells with these bits set to 1 are considered to be better candidates to be dropped than frames or cells without the bit set to 1. Named the Frame Relay Discard Eligibility (DE) bit and the ATM Cell Loss Priority (CLP) bit, these bits can be set by a router, or by an ATM or Frame Relay switch. Router and sw..
Figure 4-9 shows a small, sample network that is used in this section to show basic IPv6 connectivity using global addresses. Figure 4-9 Sample Dual-Stack IPv4/IPv6 Network The routers use dual stacks (both IPv4 and IPv6 addresses are assigned to the interfaces) for this network. Hosts with dual stacks (running both IPv4 and IPv6) would be able to send IPv4 or IPv6 packets, and the routers could accommodate either. This relatively simple example of IPv6 uses global address..
CB Policing Defaults for Bc and Be
If you do not configure a Bc value on the police command, then CB Policing configures a default value equivalent to the bytes that could be sent in 1/4 second at the defined policing rate. The formula is as follows: (CIR * 0.25 second) CIR Bc = —––––––––––––––– = –––—––––8 bits/byte 32 The only part that may not be obvious is the division by 8 on the left—that is simply for the conversion from bits to bytes. The math reduces ..
WAN Edge QoS Design Considerations
QoS policies required on WAN aggregators include queuing, shaping, selective dropping, and link-efficiency policies in the outbound direction of the WAN link. Traffic is assumed to be correctly classified and marked (at Layer 3) before WAN aggregator ingress. Remember, Layer 3 markings (preferably DSCP) are media independent and traverse the WAN media, whereas Layer 2 CoS is lost when the media switches from Ethernet to WAN media. Several factors must be kept in mind when de..
Viewing DLSw Status Information
This command shows the status of a DLSw peer relationship: Router>show dlsw peers Peers: state pkts_rx pkts_tx type drops ckts TCP uptime TCP 10.1.1.5 CONNECT 350 350 conf ..
