What is DSCP EF?

What is DSCP EF?

The Expedited Forwarding (EF) model is used to provide resources to latency (delay) sensitive real-time, interactive traffic. The EF model uses one marking — DSCP 46. The DSCP binary pattern of 101110 (46) uses six digits or binary values-32 16 8 4 2 1.

What is DSCP classification?

Differentiated Services Code Point (DSCP) is a means of classifying and managing network traffic and of providing quality of service (QoS) in modern Layer 3 IP networks. It uses the 6-bit Differentiated Services (DS) field in the IP header for the purpose of packet classification.

How does DSCP QoS work?

Quality of Service (QoS) DSCP Marking determines traffic classification for network data. This can be used to determine which network traffic requires higher bandwidth, has a higher priority, and is more likely to drop packets.

What is DSCP mapping?

The DSCP Policy Table associates an 802.1p priority with a DSCP codepoint in an IPv4/IPv6 packet. Using DSCP codepoints in your network allows you to set a LAN policy that operates independently of 802.1Q VLAN-tagging.

What is EF traffic?

The expedited forwarding (EF) per-hop behavior assures that any traffic class with EF’s related DSCP is given highest priority and is not queued. A packet that is marked with 101110 receives guaranteed low-drop precedence as the packet traverses diffserv-aware networks en route to its destination.

What is the best DSCP?

Use a DSCP value of 34. Best-effort (BE) traffic Standard traffic, including any traffic not marked with a DSCP number, that should be handled after either of the preceding two queues. This traffic should have a DSCP value of 0, which is the default if no DSCP value is specified.

What is Dscp 48?

DSCP 48 is control traffic CS6 for voice usually so it shouldn’t be in the priority queue , looking at my switches running mls its the same , queue 2. ! mls qos map cos-dscp 0 8 16 24 32 46 48 56.

What is DSCP CS4?

CS4 is 32 the nearest next dscp value is AF41 which is 34 followed by AF42 (36) and AF43 (38). CS is class selector and backwards compatible with ip precedence values. While there are 4 AF values (with each having drop preferences) Please rate all the useful posts.

What is the DSCP value in the class map command?

When you specify the ip dscp value in the class map command, you have these: The DSCP can be set to a desired value at the edge of the network in order to make it easy for core devices to classify the packet as shown in the Packet Classification section and provide a suitable level of service.

What are the commonly used DSCP values described in RFC 2475?

Table 6-1 lists the commonly used DSCP values described in RFC 2475. Table 6-1 Commonly Used DSCP Values DSCP Value Decimal Value Meaning Drop Probability Equivalent IP Precedence Value 101110 46 High Priority Expedited Forwarding (EF) N/A 101 – Critical 000000 0 Best Effort N/A 000 – Routine

What is the recommended DSCP value for the EF and EF PHBs?

Codepoint 101110 is recommended for the EF PHB, which corresponds to a DSCP value of 46. Again, vendor-specific mechanisms need to be configured to implement these PHBs.

What is the difference between marker and metering and DSCP?

Marker—Set the DSCP field based on the traffic profile. Metering—Check compliance to traffic profile using either a shaper or dropper function. Cisco IOS software considers the precedence bits of the ToS field if there is traffic that is queued in Weighted Fair Queuing (WFQ), Weighted Random Early Detection (WRED), or Weighted Round Robin (WRR).