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Cisco IOS Software Releases 12.0 S

Multicast Egress QoS Support on Cisco 12000 Series Router, Integrated Services Engine (ISE) Line Cards

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Multicast Egress QoS Support on Cisco 12000 Series Router, Integrated Services Engine (ISE) Line Cards

Table Of Contents

Multicast Egress QoS Support on Cisco 12000 Series Router, Integrated Services Engine (ISE) Line Cards

Multicast Feature Overview

Multicast Egress QoS Feature Overview

Weighted Random Early Detection for Multicast Egress QoS

Benefits

Restrictions

Related Features and Technologies

Related Documents

Supported Platforms

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Enabling Multicast Egress QoS

Disabling Multicast Egress Traffic on the Priority Queue

Verifying, Monitoring, and Troubleshooting Multicast Egress QoS

Configuration Examples

Enable Multicast Egress QoS

Prioritizing Multicast Packets for OC-192 Clock Schedular Card

Problem Description

Solution

Configuring Multicast Priority

Command Reference

hw-module slot <n> ip multicast egress-qos enable

hw-module slot <n> ip multicast egress-qos no-priority-queue

show mcast-qos queue-info [if number]

show mcast-qos group-info [if number]

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

hw-module fabric multicast-priority

Glossary


Multicast Egress QoS Support on Cisco 12000 Series Router, Integrated Services Engine (ISE) Line Cards


Part Number OL-8678-01 (Rev. A0) August 18, 2009

Feature History

Release
Modification

12.0(32)S

This feature was introduced on the Cisco 12000 Series Integrated Services Engine (ISE).

12.0(31.04)SY01, 12.0(31)S06, 12.0(31)s, 12.0(32)S03, and 12.0(32.01)S12

This feature was introduced for document bug id CSCsr06355 and engineering bug id CSCsd83355 for addition of a new command hw-module fabric multicast-priority. This command is specifically used to assign higher priority to multicast packets than unicast packets. Multicast packet drops can be avoided by setting the priority of multicast packets higher than unicast packets. This command must be used only for clock schedular cards (CSC) of OC-192 type.


This document contains the following sections.

Multicast Feature Overview

Multicast Egress QoS Feature Overview

Supported Platforms

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Command Reference

Prioritizing Multicast Packets for OC-192 Clock Schedular Card

Command Reference

Multicast Feature Overview

Internet has widely become the predominant communication means for transmitting information in the form of data, voice, and video and so on. Transmission of voice and video without any delay is critical. Providing simultaneous delivery of voice or video to a large number of recipients simultaneously is a challenge. Any form of network communication involving the transmission to multiple recipients can benefit from the bandwidth efficiency of multicast technology. Multicast functionality involves the transmission of information to a multicast group, regardless of the number of client members in the group. The benefits of multicast technology are less consumption of bandwidth and information is nearly simultaneously delivered to all the members of the recipient group. Multicast must be used instead of unicast to save bandwidth and quick delivery of high priority applications such as voice, video, etc.

Multicast Egress QoS Feature Overview

The Multicast Egress QoS feature provides the following egress QoS capabilities for multicast traffic:

Classification based on precedence/DSCP

Queue selection

Maximum/minimum bandwidth guarantee

Detection of remaining bandwidth

Priority queueing

Queue limit

Random Early Detection (RED)

Traffic shaping

Layer 2 set on ATM and Ethernet

Multicast Egress QoS uses the Modular QoS CLI (MQC) to enable QoS functionality. The Modular QoS CLI (MQC) is a platform independent interface for configuring QoS on Cisco platforms. Multicast Egress QoS relies the Modular QoS CLI (MQC) to accomplish the following tasks.

Selecting queues

Applying minimum and maximum bandwidth guarantees

Detecting remaining bandwidth

Setting queue limit

Defining traffic shaping

Applying Weighted Random Early Detection (WRED) to a queue

Weighted Random Early Detection for Multicast Egress QoS

Weighted Random Early Detection (WRED) for Multicast Egress QoS is supported on all Integrated Services Engine (ISE) line cards.

Policy-map configurations that use Random Early Detection (RED) must comply with the following requirements:

The same class-maps must be used in all policy-maps.

Class-maps must be configured in the same order in all policy-maps.

The same Random Early Detection (RED) statements must be configured in a class-map across all policy-maps. However, the minimum and maximum thresholds can be different in each policy-map.

If a Random Early Detection (RED) profile is used by more than one precedence (DSCP) within a class, then those precedences must use the same Random Early Detection (RED) profile in all policy-maps.

The policy-map configuration requirements must be met across all the interfaces of a VPN Routing/Forwarding Instance (VRF) on an egress line card. If VPN Routing/Forwarding Instance (VRF) is not configured on the line card, these requirements must be met across all the interfaces on the egress line card.

Time-based Weighted Random Early Detection (WRED) is supported if the policy-map configuration requirements are met.

Interfaces without policy-maps and interfaces with policy-maps that do not use Random Early Detection (RED) function normally.

Multicast traffic on VPN Routing/Forwarding Instance (VRF) interfaces that do not meet the policy-map configuration requirements will be dropped when the queue limit exceeded.

For hierarchical policy-maps that use Weighted Random Early Detection (WRED), only the child policies should conform to the the policy-map configuration requirements.

Example of Conforming Policy-map Configuration

The following example shows the correct policy-map configuration to enable Weighted Random Early Detection (WRED) for Multicast Egress QoS. In this example, interfaces A and B belong to the same VPN Routing/Forwarding Instance (VRF) and are configured with the same classes and Random Early Detection (RED) statements.

Precedences 2 and 3 are mapped to the same Random Early Detection (RED) profile in both P1 and P2 (which is a requirement) although the minimum and maximum Random Early Detection (RED) thresholds are different. Interface C belongs to another VPN Routing/Forwarding Instance (VRF) and is configured differently than interfaces A and B.

Interface A—VRF 1

Router#config t
Router(config)#policy-map P1
Router(config-pmap)#class class123
Router(config-pmap-c)#bandwidth 10M
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 1 50 100 1
Router(config-pmap-c)#random-detect precedence 2 150 300 1
Router(config-pmap-c)#random-detect precedence 3 150 300 1
Router(config-pmap)#class class45
Router(config-pmap-c)#bandwidth 20M
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 4 70 130 1
Router(config-pmap-c)#random-detect precedence 5 180 400 1

Interface B—VRF 1

Router#config t
Router(config)#policy-map P2
Router(config-pmap)#class class123
Router(config-pmap-c)#bandwidth 30M
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 1 60 120 1
Router(config-pmap-c)#random-detect precedence 2 160 320 1
Router(config-pmap-c)#random-detect precedence 3 160 320 1
Router(config-pmap-c)#exit
Router(config-pmap)#class class45
Router(config-pmap-c)#bandwidth 10M
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 4 90 180 1
Router(config-pmap-c)#random-detect precedence 5 180 250 1
Router(config-pmap-c)#exit

Interface C—VRF 2

Router#config t
Router(config)#policy-map P3
Router(config-pmap)#class class234
Router(config-pmap-c)#bandwidth 3M
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 2 40 200 1
Router(config-pmap-c)#random-detect precedence 3 50 400 1
Router(config-pmap-c)#exit
Router(config-pmap)#class class56
Router(config-pmap-c)#bandwidth 10M
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 5 100 200 1
Router(config-pmap-c)#random-detect precedence 6 200 300 1
Router(config-pmap-c)#exit

Non-conforming Policy-map Configuration—Example

The following example shows a policy-map configuration that does not enable Weighted Random Early Detection (WRED) for Multicast Egress QoS. Interfaces A and B will be tail dropped. Policies p1 and p2 are attached to two different interfaces in the same VPN Routing/Forwarding Instance (VRF) and are configured with different classes.

Router#config t
Router(config)#policy-map p1
Router(config-pmap)#class prec23 
Router(config-pmap-c)#band 10M
Router(config-pmap-c)#random-detect 2 40 100 1 
Router(config-pmap-c)#random-detect 3 60 200 1
Router(config-pmap-c)exit
Router(config-pmap)class prec45
Router(config-pmap-c)#band 20M
Router(config-pmap-c)#random-detect 4 30 200 1 
Router(config-pmap-c)#random-detect 5 70 300 1
Router(config-pmap-c)exit
Router(config)#policy-map p2 
Router(config-pmap)class prec 3
Router(config-pmap-c)#band 20M
Router(config-pmap-c)#random-detect 3 30 200 1 
Router(config-pmap-c)exit

Benefits

Multicast Egress QoS runs on Cisco IOS software. IP multicast is a bandwidth-conserving technology that reduces traffic by simultaneously delivering a single stream of information to multiple recipients.

Multicast Egress QoS Support on Cisco 12000 Series Router, Integrated Services Engine (ISE) line cards provides the ability to select a queue and apply the following configuration features to the queue:

Maximum and minimum guaranteed bandwidth

Remaining bandwidth

Queue limit

Traffic shaping

Weighted Random Early Detection (WRED)
Fully supported on ATM line cards only
Partially supported on POS, Ethernet, and Channelized line cards

Layer 2 set on ATM and Ethernet

Restrictions

Multicast Egress QoS does NOT support the following features in the Release 12.0(32)S:

Discard-class based Random Early Detection (RED) is not supported. Weighted Random Early Detection (WRED) is supported fully on ATM line cards and is supported with restrictions on POS, Ethernet, and channelized line cards.

Classification other than dscp/precedence is not supported.

Layer 3 set is not supported.

QoS is not active when packets go to the slow path. All packets go to the default queue.

IPv6 Multicast is not supported.

Cisco 12000 SIP-400 is not supported.

Policing traffic is not supported. Consequently, the hw-module slot 1 ip multicast egress-qos no-priority-queue command is used to prevent traffic from reaching the priority queue.

Related Features and Technologies

Cisco IOS Quality of Service (QoS) Solutions for Cisco 12000 Series Router.

Related Documents

For further information on configuring Cisco 12000 series routers, refer to the following documents.

Multicast Quick-Start Configuration Guide

Cisco 12000 Series Router Configuration Guide for Cisco IOS

Cisco IOS Release 12.0S Features for Cisco 12000 Series Internet Router

Cisco IOS Quality of Service Solutions Configuration Guide

Cisco IOS Quality of Service Solutions Command Reference

Installation and Configuration Guide for the specific router

Supported Platforms

Multicast Egress QoS is supported on Cisco IOS Release 12.0(32)S of the Cisco 12000 Series Integrated Services Engine (ISE) line cards, which includes the following line cards:

POS Line Cards

1-port OC48c/STM16c POS

1-port CHOC48/STM16>OC12/STM4>OC3/STM1>DS3/E3

4-port OC12c/STM16c POS

4-port CHOC12/STM4>OC3/STM1>DS3/E3

16-port OC3c/STM1c POS

4-port OC3c/STM1c POS

8-port OC3c/STM1c POS

Ethernet Line Cards

4-port Gigabit Ethernet ISE Line Card

ATM Line Cards

4-port OC12/STM4 ATM LC

8-port OC3/STM1 ATM LC

4-port OC-3/STM-1 ATM LC

Channelized Line Cards

1-port OC12 DS1

Supported Standards, MIBs, and RFCs

Multicast Egress QoS uses the IP Multicast MIBs and the following MIB:

MIB

CISCO-CLASS-BASED-QOS-MIB

Prerequisites

Multicast Egress QoS can only be configured on an interface that is already configured for Cisco IP Multicast IOS.

Configuration Tasks

See the following sections for configuration tasks for the Multicast Egress QoS feature.

Enabling Multicast Egress QoS

Disabling Multicast Egress Traffic on the Priority Queue

Verifying, Monitoring, and Troubleshooting Multicast Egress QoS

Enabling Multicast Egress QoS

To enable the Multicast Egress QoS feature on ISE line cards, use the hw-module slot <n> ip multicast egress-qos enable command in global configuration mode.

 
Command
Purpose

Step 1 

Router#config t

Enter configuration mode.

Step 2 

Router(config)# hw-module slot 1 ip multicast egress-qos enable

Enable Multicast Egress QoS.

Disabling Multicast Egress Traffic on the Priority Queue

To prevent multicast egress traffic from being transmitted to the priority queue, use the hw-module slot <n> ip multicast egress-qos no-priority-queue command in global configuration mode. To allow multicast egress traffic to be transmitted to the priority queue, use the no form of this command.

 
Command
Purpose

Step 1 

Router#config t

Enter configuration mode.

Step 2 

Router(config)# hw-module slot 1 ip multicast egress-qos no-priority-queue

Prevents multicast traffic from being sent to the priority queue.

Verifying, Monitoring, and Troubleshooting Multicast Egress QoS

You can verify, monitor, and troubleshoot Multicast Egress QoS using the following show commands:

Command
Purpose
Router#show running-config

Shows the current configuration on the router. Use this command to verify that Multicast Egress QoS is running.

LC-Slot1#show mcast-qos queue-info

Displays queue information. Use this command to verify the correct configuration of queues.

LC-Slot1#show mcast-qos group-info

Displays group information.

LC-Slot1#show ip hardware-mdfs egress-qos conga 

Displays the MGIDs numbers.

LC-Slot1#show ip hardware-mdfs egress-qos 
wred-alpha

Displays the REDCOS bits.

LC-Slot1#show ip hardware-mdfs egress-qos alpha

Displays the DSCP mapping table and local MGID/counting information.

Router#show policy interface <intf>

Displays the policy configured on the interface.


Configuration Examples

This section provides the following configuration examples:

Enable Multicast Egress QoS

Enable Multicast Egress QoS

This example shows how to enable Multicast Egress QoS.

Router#config t
Router(config)#hostname Router 12000
Router(config)#
Router(config)#enable password cisco
Router(config)#
Router(config)#monitor event-trace rlc all enable
Router(config)#power-mgr additive
Router(config)#hw-module slot 0 ip multicast hw-accelerate source-table size 16 offset 0
Router(config)#hw-module slot 0 ip multicast raw-queue limit 2048
Router(config)#hw-module slot 0 ip multicast egress-qos enable
Router(config)#ip subnet-zero
Router(config)#ip cef table hardware resource-failure action punt 
Router(config)#no ip domain-lookup
Router(config)#ip multicast-routing distributed
Router(config)#
Router(config)#class-map match-all prec1
Router(config-cmap)#match ip precedence 1 
Router(config-cmap)#exit
Router(config)#class-map match-all prec2
Router(config-cmap)#match ip precedence 2 
Router(config-cmap)#exit
Router(config)#
Router(config)#policy-map policy1
Router(config-pmap)#class prec1
Router(config-pmap-c)#bandwidth percent 20
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 1 50 packets 100 packets 1
Router(config-pmap)#class prec2
Router(config-pmap-c)#bandwidth percent 10
Router(config-pmap-c)#exit
Router(config-pmap)#class class-default
Router(config-pmap-c)#queue-limit 300 ms
Router(config-pmap-c)#random-detect
Router(config-pmap-c)#random-detect precedence 3 200 packets 400 packets 1
Router(config-pmap-c)#exit
Router(config-pmap)#exit
Router(config)#
Router(config)#controller SYSCLOCK 0
Router(config-controller)#exit
Router(config)#controller T1 9/0
Router(config-controller)#exit
Router(config)#controller E1 9/1
Router(config-controller)#exit
Router(config)#
Router(config)#interface Loopback0
Router(config-if)#ip address 192.168.100.5 255.255.255.255
Router(config-if)#no ip directed-broadcast
Router(config-if)#ip pim sparse-dense-mode
Router(config-if)#exit
Router(config)#
Router(config)#interface POS0/0
Router(config-if)#description Connected to C12406_CH POS 1/0
Router(config-if)#ip address 40.0.0.1 255.255.255.252
Router(config-if)#no ip directed-broadcast
Router(config-if)#ip pim sparse-dense-mode
Router(config-if)#ip igmp static-group 224.1.1.1
Router(config-if)#crc 32
Router(config-if)#clock source internal
Router(config-if)#service-policy output policy1
Router(config-if)#exit
Router(config)#
Router(config)#interface POS0/1
Router(config-if)#description Connected to M8850_LA RPM-XF Slot 10 POS 1/0
Router(config-if)#ip address 60.0.0.2 255.255.255.252
Router(config-if)#no ip directed-broadcast
Router(config-if)#ip pim sparse-dense-mode
Router(config-if)#ip igmp static-group 224.1.1.1
Router(config-if)#crc 32
Router(config-if)#clock source internal
Router(config-if)#exit
Router(config)#
Router(config)#router ospf 1
Router(config-if)#log-adjacency-changes
Router(config-if)#network 40.0.0.0 0.0.0.255 area 0
Router(config-if)#network 60.0.0.0 0.0.0.255 area 0
Router(config-if)#network 192.168.100.5 0.0.0.0 area 0
Router(config-if)#ip classless
Router(config-if)#ip route 0.0.0.0 0.0.0.0 172.29.52.1
Router(config-if)#ip pim send-rp-announce Loopback0 scope 16
Router(config-if)#ip pim send-rp-discovery scope 16
Router(config-if)#exit
Router(config)#
Router(config)#slot-table-cos 1
Router(config-if)#exit
Router(config)#
Router(config)#control-plane
Router(config-cp)#exit
Router(config)#
Router(config)#line con 0
Router(config-line)#exec-timeout 0 0
Router(config-line)#exit
Router(config)#
Router(config)#line aux 0
Router(config-line)#exit
Router(config)#
Router(config)#line vty 0 4
Router(config-line)#exec-timeout 0 0
Router(config-line)#password cisco
Router(config-line)#login
Router(config-line)#exit
Router(config)#
Router(config)#exception warmstart 60 5 
Router(config)#no cns aaa enable 
Router(config)#exit
Router#

Prioritizing Multicast Packets for OC-192 Clock Schedular Card

The following sections explains why multicast packet drops occur for OC-192 CSC, how to prevent the multicast packet drops, the configuration steps and the usage of the new command hw-module fabric multicast-priority.

Problem Description

Multicast packet drops occur on a Cisco 12410 or 12416 Router Chassis for clock schedular cards of OC-192 type, when traffic flowing the fabric is both unicast and multicast. Packet drops occur when the priority of unicast packets is greater than or equal to mutlicast packets. These drops can have impact on video traffic which is not learnt to loss of packets or jitters.

Solution

For the units using switch fabric on SCA 192 scheduler, multicast must be set to higher priority than unicast using the command hw-module fabric multicast-priority. Also the links carrying multicast traffic must not be oversubscribed. To solve the multicast packet drops either configure the command `hw-module fabric multicast-priority' or replace the OC-192 clock schedular card with OC-768 type.

Configuring Multicast Priority

To configure the multicast priority higher than unicast packets, use the hw-module fabric multicast-priority command in global configuration mode. Before executing the command, use the command show controllers sca to verify if the priority is configured as multicast or unicast.

 
Command
Purpose

Step 1 

Router# show controllers sca

Verifies if the priority is configured as multicast or unicast. If the priority is configured as multicast then the command output shows `Config 0x00 pri-mcast' and if the priority is configured as unicast then the command output shows `Config 0xC0 unicast-accept-mode pri-alternating'.

Step 2 

Router# config t

Enter configuration mode.

Step 3 

Router(config)# hw-module fabric multicast-priority

Assigns multicast packets higher priority over unicast packets. For details regarding the command usage, see "hw-module fabric multicast-priority".

Command Reference

This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0(32)S command reference publications.

This section provides detailed descriptions of the following commands:

hw-module slot <n> ip multicast egress-qos enable

hw-module slot <n> ip multicast egress-qos no-priority-queue

show mcast-qos queue-info [if number]

show mcast-qos group-info [if number]

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

hw-module fabric multicast-priority

hw-module slot <n> ip multicast egress-qos enable

To enable the Multicast Egress QoS feature on ISE line cards, use the hw-module slot <n> ip multicast egress-qos enable command in global configuration mode.

To disable the Multicast Egress QoS feature on ISE line cards, use the no form of this command.

Cisco IOS

hw-module slot <n> ip multicast egress-qos enable

[no] hw-module slot <n> ip multicast egress-qos enable

Syntax Description

n

Variable that specifies the slot number of the egress line card.

ip

Keyword that specifies the IP specific feature.

multicast

Keyword that specifies the Multicast configuration feature.

egress-qos

Keyword that specifies Multicast Egress QoS.

enable

Keyword that enables the Multicast Egress QoS feature.


Defaults

The default state of the Multicast Egress QoS feature is disabled.

Command Default

[no] hw-module slot <n> ip multicast egress-qos enable

Command Modes

Global configuration

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

When the Multicast Egress QoS feature is disabled all multicast traffic is transmitted on default queue.

Multicast packets are not included in policy-map counters.

When this feature is enabled, it displays the following message:

Multicast traffic cannot be policed. Use "hw-module slot <slot> ip multicast egress-cos 
no-priority-queue" to disable multicast traffic from reaching the priority queue.

Examples

The following example shows how to enable the Multicast Egress QoS feature on slot 1.

Router#config t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#
Router(config)#hw-module slot 1 ip multicast egress-qos enable
Router(config)#

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos no-priority-queue

Prevents multicast traffic from reaching the priority queue.

show mcast-qos queue-info [if number]

Displays the database queue information of an interface on a line card that is configured for Multicast Egress QoS.

show mcast-qos group-info [if number]

Displays the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured.

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the local MGIDs associated with a set of classes for a group address or a particular mroute.

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

Displays the list of interfaces associated with a particular local MGID.

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the actual DSCP mapping table and its local MGID/counting information.

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Displays the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP.


hw-module slot <n> ip multicast egress-qos no-priority-queue

To prevent Multicast Egress QoS traffic from being transmitted to the priority queue, use the hw-module slot <n> ip multicast egress-qos no-priority-queue command in global configuration mode. To allow Multicast Egress QoS traffic to be transmitted to the priority queue, use the no form of this command.

Cisco IOS

hw-module slot <n> ip multicast egress-qos no-priority-queue

[no] hw-module slot <n> ip multicast egress-qos no-priority-queue

Syntax Description

n

Variable that specifies the slot number of the egress line card.

ip

Keyword that specifies the IP specific feature.

multicast

Keyword that specifies the Multicast configuration feature.

egress-qos

Keyword that specifies Multicast Egress QoS.

no-priority-queue

Keyword that specifies that Multicast Egress QoS traffic will NOT be transmitted to the priority queue.


Defaults

Multicast Egress QoS traffic will be sent to the priority queue.

Command Modes

Global configuration

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

When Multicast Egress QoS traffic is prevented from reaching the priority queue, it is sent to the default queue.

The hw-module slot <n> ip multicast egress-qos no-priority-queue command can only be used when the Multicast Egress QoS feature has been enabled using the hw-module slot <n> ip multicast egress-qos enable command.

Examples

The following example shows how to prevent Multicast Egress QoS traffic from being sent to the priority queue on slot 1.

Router#config t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hw-module slot 1 ip multicast egress-qos no-priority-queue
Router(config)#

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos enable

Enables the Multicast Egress QoS feature on ISE line cards.

show mcast-qos queue-info [if number]

Displays the database queue information of an interface on a line card that is configured for Multicast Egress QoS.

show mcast-qos group-info [if number]

Displays the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured.

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the local MGIDs associated with a set of classes for a group address or a particular mroute.

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

Displays the list of interfaces associated with a particular local MGID.

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the DSCP mapping table and its local MGID/counting information.

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Displays the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP.


show mcast-qos queue-info [if number]

To display the database queue information of an interface on a line card that is configured for Multicast Egress QoS, use the show mcast-qos queue-info [if number] command in EXEC mode.

Cisco IOS

show mcast-qos queue-info [if number]

Syntax Description

mcast-qos

Keyword that specifies multicast QoS.

queue-info

Keyword that requests queue information from the database.

if number

Variable that specifies the interface number.


Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

Use the show mcast-qos queue-info [if number] command for trouble shooting. The show mcast-qos queue-info [if number] command displays the current Multicast Egress QoS configuration and which classes it recognizes. It also displays the following information:

Queue—the queue number

Level—if this is a hierarchical policy

Type—output queue or output info

Set—if there is an L2 set command on the class

Class—the number of the class-map

DSCP—the DSCP values associated with this class

Examples

The following example shows how to get the Multicast Egress QoS queue information from the QoS database for interface number 2/1.

LC-Slot1#
LC-Slot1#show mcast-qos queue-info 15
Interface GigabitEthernet2/1
----------------------------------------
Index   Queue # level   type            Set     Class   DSCPs
1       Default 0       OUTPUT QUEUE    0       0       0-7, 24-63
2       5       0       OUTPUT QUEUE    0       7       8-15
3       6       0       OUTPUT QUEUE    0       8       16-23

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos enable

Enables the Multicast Egress QoS feature on ISE line cards.

hw-module slot <n> ip multicast egress-qos no-priority-queue

Prevents multicast traffic from reaching the priority queue.

show mcast-qos group-info [if number]

Displays the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured.

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the local MGIDs associated with a set of classes for a group address or a particular mroute.

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

Displays the list of interfaces associated with a particular local MGID.

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the actual DSCP mapping table and its local MGID/counting information.

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Displays the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP.


show mcast-qos group-info [if number]

To display the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured, use the show mcast-qos group-info [if number] command in EXEC mode.

Cisco IOS

show mcast-qos group-info [if number]

Syntax Description

mcast-qos

Keyword that specifies multicast QoS.

group-info

Keyword that requests group information from the database.

if number

Variable that specifies the interface number.


Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

Use the show mcast-qos group-info [if number] command for troubleshooting. The show mcast-qos group-info [if number] command displays the current Multicast Egress QoS configuration and the classes it recognizes. It also displays:

Queue—the queue number

Level—if this is a hierarchical policy

Type—output queue or output info

Set—if there is a Layer 2 set command on the class

Class—the number of the class-map

DSCP—the DSCP values associated with this class

In the Examples below, the VGL is the sub-interface.

Examples

The following example shows how to get the Multicast Egress QoS group information from the QoS database for interface number 1.

LC-Slot1#
LC-Slot1#show mcast-qos group-info 15
Parent Policy-map for interface GigabitEthernet2/1
VGL: 1
Qeueue  Queue # level   type            Set     Class   DSCPs
1       Default 1       OUTPUT QUEUE    0       0       0-7, 24-63
2       17      1       OUTPUT QUEUE    0       7       8-15
3       18      1       OUTPUT QUEUE    0       8       16-23
VGL: 10
Qeueue  Queue # level   type            Set     Class   DSCPs
1       Default 1       OUTPUT QUEUE    0       0       0-7, 16-63
2       21      1       OUTPUT QUEUE    0       7       8-15

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos enable

Enables the Multicast Egress QoS feature on ISE line cards.

hw-module slot <n> ip multicast egress-qos no-priority-queue

Prevents multicast traffic from reaching the priority queue.

show mcast-qos queue-info [if number]

Displays the database queue information of an interface on a line card that is configured for Multicast Egress QoS.

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the local MGIDs associated with a set of classes for a group address or a particular mroute.

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

Displays the list of interfaces associated with a particular local MGID.

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the actual DSCP mapping table and its local MGID/counting information.

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Displays the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP.


show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

To display the local MGIDs associated with a set of classes for a group address or a particular mroute, use the show ip hardware-mdfs egress-qos conga local-mgids command in EXEC mode.

Cisco IOS

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Syntax Description

local-mgids

Keyword that specifies all local Multicast Group Identifiers (mgids).

group addr

Variable that specifies the IP address to which the multicast stream is transmitted. For example, 224.1.1.1

src addr

Variable that specifies the source IP address of the multicast stream.

vrf

Keyword that specifies the VPN Routing/Forwarding Instance (VRF).

VRF name

Variable that specifies the name of the VPN Routing/Forwarding Instance (VRF).


Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

The Multicast Identifier (MGID) is the multicast group identifier (ID) that holds the list of the default queues for the interfaces to which the multicast stream is replicated.

The local MGID is the identifier that holds the list of the different queues (default or non-default) that the stream should be replicated to. Each MGID is associated with a DSCP value.

Examples

The following example shows the local MGIDs associated with group address 224.1.1.1 and source address 1.1.1.2.

LC-Slot1#
LC-Slot1#show ip hardware-mdfs egress-qos conga local-mgids 224.1.1.1 1.1.1.2
The Local MGIDs are:
3FFFA
3FFFC
LC-Slot1#

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos enable

Enables the Multicast Egress QoS feature on ISE line cards.

hw-module slot <n> ip multicast egress-qos no-priority-queue

Prevents multicast traffic from reaching the priority queue.

show mcast-qos queue-info [if number]

Displays the database queue information of an interface on a line card that is configured for Multicast Egress QoS.

show mcast-qos group-info [if number]

Displays the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured.

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

Displays the list of interfaces associated with a particular local MGID.

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the actual DSCP mapping table and its local MGID/counting information.

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Displays the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP.


show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

To display the list of interfaces associated with a particular local MGID, use the show ip hardware-mdfs egress-qos conga hw-midbs command in EXEC mode.

Cisco IOS

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [ <src addr>]

Syntax Description

hw-midbs

Keyword that specifies all interfaces associated with an mroute.

Local MGID

Variable that specifies the local Multicast Group Identifier (MGID).

all-mgids

Keyword that specifies all Multicast Group Identifiers (mgids).

src addr

Variable that specifies the source IP address of the multicast stream.

group addr

Variable that specifies the IP address to which the multicast stream is transmitted. For example, 224.1.1.1

vrf

Keyword that specifies the VPN Routing/Forwarding Instance (VRF).

VRF name

Variable that specifies the name of the VPN Routing/Forwarding Instance (VRF).


Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

The Multicast Identifier (MGID) is the multicast group identifier (ID) that holds the list of the default queues for the interfaces to which the multicast stream is replicated.

The local MGID is the identifier that holds the list of the different queues (default or non-default) that the stream should be replicated to. Each MGID is associated with a DSCP value.

Examples

The following example shows how to get the list of interfaces of all-mgids in a stream coming from address 1.1.1.2 with ip address of 224.1.1.1:

LC-Slot2#show ip hardware-mdfs egress-qos conga hw-midb all-mgids 224.1.1.1 1.1.1.2
The Local MGIDs are:
3FFFD
MGID:3FFFD,
Entry 0: index:0, if_number:4
Entry 1: index:1, if_number:33
Entry 2: index:2, if_number:34
3FFFE
MGID:3FFFE,
Entry 0: index:0, if_number:4
Entry 1: index:1, if_number:33
Entry 2: index:2, if_number:34

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos enable

Enables the Multicast Egress QoS feature on ISE line cards.

hw-module slot <n> ip multicast egress-qos no-priority-queue

Prevents multicast traffic from reaching the priority queue.

show mcast-qos queue-info [if number]

Displays the database queue information of an interface on a line card that is configured for Multicast Egress QoS.

show mcast-qos group-info [if number]

Displays the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured.

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the local MGIDs associated with a set of classes for a group address or a particular mroute.

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the actual DSCP mapping table and its local MGID/counting information.

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Displays the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP.


show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

To display the DSCP mapping table and its local MGID/counting information, use the show ip hardware-mdfs egress-qos alpha command in EXEC configuration mode.

Cisco IOS

show ip hardware-mdfs egress-qos alpha [<group addr> <src addr> | vrf <VRF name> <group addr> <src addr>]

Syntax Description

group addr

Variable that specifies the IP address to which the multicast stream is transmitted. For example, 224.1.1.1

src addr

Variable that specifies the source IP address of the multicast stream.

vrf

Keyword that specifies the VPN Routing/Forwarding Instance (VRF).

VRF name

Variable that specifies the name of the VPN Routing/Forwarding Instance (VRF).

src addr

Variable that specifies the source IP address of the VRF.

group addr

Variable that specifies the IP address to which the VRF is transmitted.


Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

The Multicast Identifier (MGID) is the multicast group identifier (ID) that holds the list of the default queues for the interfaces to which the multicast stream is replicated.

The local MGID is the identifier that holds the list of the different queues (default or non-default) that the stream should be replicated to. Each MGID is associated with a DSCP value.

Examples

The following example shows how to display the DSCP mapping table and its local MGID/counting information.

LC-Slot1#
LC-Slot1#show ip hardware-mdfs egress-qos alpha 224.1.1.1 1.1.1.2
The vrf is Default
TX side
(S=1.1.1.2, G=224.1.1.1), Global MGID: 7E
There are 3 different tx qos group for this (S,G):
0 .COS[def]: 
0,1,2,3,4,5,6,7,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48
,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
      Local MGID: 0000007E
1 .COS     : 8,9,10,11,12,13,14,15,
      Local MGID: 0003FFFA
2 .COS     : 16,17,18,19,20,21,22,23,
      Local MGID: 0003FFFC
LC-Slot1#

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos enable

Enables the Multicast Egress QoS feature on ISE line cards.

hw-module slot <n> ip multicast egress-qos no-priority-queue

Prevents multicast traffic from reaching the priority queue.

show mcast-qos queue-info [if number]

Displays the database queue information of an interface on a line card that is configured for Multicast Egress QoS.

show mcast-qos group-info [if number]

Displays the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured.

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the local MGIDs associated with a set of classes for a group address or a particular mroute.

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

Displays the list of interfaces associated with a particular local MGID.

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Displays the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP.


show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

To display the Random Early Detection Class of Service Bits (REDCOS bits) for all DSCP or for a specific DSCP, use the show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>] command in EXEC configuration mode.

Cisco IOS

show ip hardware-mdfs egress-qos wred-alpha [vrf <VRF name> | DSCP <dscp>]

Syntax Description

vrf

Keyword that specifies the VPN Routing/Forwarding Instance (VRF).

VRF name

Variable that specifies the name of the VPN Routing/Forwarding Instance (VRF).

DSCP

Keyword that specifies that the next variable is the Differentiated Services Code Point (DSCP) value.

dscp

Variable that specifies the Differentiated Services Code Point (DSCP), a value of 0-63. In Multicast Egress QoS, the DSCP value specifies the QoS.


Defaults

No default behavior or values.

Command Modes

EXEC

Command History

Release
Modification

12.0(32)S

This command was introduced.


Usage Guidelines

This command displays the REDCOS bits in the context of the specified VRF . If no VRF is specified the global VRF values are shown. This command is only applicable in alpha transmission on line cards that support Multicast Egress QoS.

This command is not supported on ATM line cards.

Examples

The following example shows the REDCOS bits associated with each DSCP value in the global vrf (interfaces that do not belong to a specific vrf):

Router#
Router#show ip hardware-mdfs egress-qos wred-alpha 224.1.1.1 1.1.1.2
DSCP REDCOS    DSCP REDCOS    DSCP REDCOS    DSCP REDCOS
0     0        1     0        2     0        3     0
4     0        5     0        6     0        7     0
8     1        9     1        10    1        11    1
12    1        13    1        14    1        15    1
16    0        17    0        18    0        19    0
20    0        21    0        22    0        23    0
24    1        25    1        26    1        27    1
28    1        29    1        30    1        31    1
32    0        33    0        34    0        35    0
36    0        37    0        38    0        39    0
40    0        41    0        42    0        43    0
44    0        45    0        46    0        47    0
48    0        49    0        50    0        51    0
52    0        53    0        54    0        55    0
56    0        57    0        58    0        59    0
60    0        61    0        62    0        63    0

Related Commands

Command
Description

hw-module slot <n> ip multicast egress-qos enable

Enables the Multicast Egress QoS feature on ISE line cards.

hw-module slot <n> ip multicast egress-qos no-priority-queue

Prevents multicast traffic from reaching the priority queue.

show mcast-qos queue-info [if number]

Displays the database queue information of an interface on a line card that is configured for Multicast Egress QoS.

show mcast-qos group-info [if number]

Displays the QoS database group information about an interface on a line card that is configured for Multicast Egress QoS when nCmD/1CnD models are configured.

show ip hardware-mdfs egress-qos conga local-mgids | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the local MGIDs associated with a set of classes for a group address or a particular mroute.

show ip hardware-mdfs egress-qos conga hw-midbs | <Local MGID> | <Local MGID> vrf <VRF name> | all-mgids <group addr> [<src addr] | vrf <VRF name> <group addr> [<src addr>]

Displays the list of interfaces associated with a particular local MGID.

show ip hardware-mdfs egress-qos alpha | <group addr> [<src addr>] | vrf <VRF name> <group addr> [<src addr>]

Displays the actual DSCP mapping table and its local MGID/counting information.


hw-module fabric multicast-priority

To avoid multicast packet drops for clock schedular cards of OC-192 type, change the priority of multicast packets higher than unicast packets, using the hw-module fabric multicast-priority command in global configuration mode.

Cisco IOS

hw-module fabric multicast-priority

Syntax Description

Not Applicable

Defaults

No default behavior or values.

Command Modes

Global Configuration

Command History

Release
Modification

12.0(31.04)SY01, 12.0(31)S06, 12.0(31)s, 12.0(32)S03, and 12.0(32.01)S12

This command was introduced.


Usage Guidelines

Multicast packet drops are observed when the CSC is an OC-192 type and the traffic flowing through it is both unicast and multicast. If the priority of unicast packet is equal to or greater than multicast than multicast packets are dropped. As a result, the voice or video traffic which is sensitive to delay transmission is affected.

In such scenario, use the command hw-module fabric multicast-priority to set the priority of multicast priority higher than unicast packets. This command is considered safe to configure as there is no packet loss for unicast traffic. You can use the show controllers sca command to confirm if the priority is configured as unicast or multicast. If multicast priority is configured then the show controllers sca output displays "Config 0x00 pri-mcast" and if unicast priority is configured then the command output displays "Config 0xC0 unicast-accept-mode pri-alternating".

Examples

The following example shows that the packet priority is configured as unicast:

Router# show controllers sca
Glad0934#sh controllers sca
SCA (Scheduler Control ASIC)   Registers:

Slot # 16 (CSC_0) 
Register                Value
26000                   11 4E 00 03 C0 00 00 00 
26008                   00 00 00 00 00 00 00 00 
26010                   00 00 02 02 05 05 00 00 
26018                   00 00 FF 00 00 01 01 00 
26020                   50 00 00 00 00 00 00 
SCA identifier          114E      Rev 1 of part number 334 
Interrupt status        0x00
Interrupt enable        0x03      parity-error overflow 
Config                  0xC0      unicast-accept-mode pri-alternating 
Rotation Period         0x00
Parity error log        0x0000
Parity error disabled   0x0000
Parity error enabled    0x0000
FIFO overflow log       0x0000
FIFO overflow disbled   0x0000
FIFO overflow enabled   0x0000
Line card enable        0x0205    Slots  0 2 9 
Forced back pressure    0x0000
SW reset                0xFF
Line Cards Type OC192   0x0001    Slots  0 
Line Cards Type OC48 and below
                        0xFFFE    Slots  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 
Line Card Priority      0x00      oc192-low-priority 
                                  legacy-line-card-priority-00 
SLI Control             0x50      sli-tdelay-10 remote-card-present 
                        0x00
Disable Grants          0x0000
Diag Control            0x00
Diag Address            0x00
Diag Data               0x00

The following example shows how to configure the priority of multicast higher than unicast using the command hw-module fabric multicast-priority:

Router# config t
Router(config)# hw-module fabric multicast-priority


The following example shows that the packet priority is configured as multicast:

Router# show controllers sca
SCA (Scheduler Control ASIC)   Registers:

Slot # 16 (CSC_0) 
Register                Value
26000                   11 4E 00 03 00 00 00 00 
26008                   00 00 00 00 00 00 00 00 
26010                   00 00 02 02 05 05 00 00 
26018                   00 00 FF 00 00 01 01 00 
26020                   50 00 00 00 00 00 00 
SCA identifier          114E      Rev 1 of part number 334 
Interrupt status        0x00
Interrupt enable        0x03      parity-error overflow 
Config                  0x00      pri-mcast 
Rotation Period         0x00
Parity error log        0x0000
Parity error disabled   0x0000
Parity error enabled    0x0000
FIFO overflow log       0x0000
FIFO overflow disbled   0x0000
FIFO overflow enabled   0x0000
Line card enable        0x0205    Slots  0 2 9 
Forced back pressure    0x0000
SW reset                0xFF
Line Cards Type OC192   0x0001    Slots  0 
Line Cards Type OC48 and below
                        0xFFFE    Slots  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 
Line Card Priority      0x00      oc192-low-priority 
                                  legacy-line-card-priority-00 
SLI Control             0x50      sli-tdelay-10 remote-card-present 
                        0x00
Disable Grants          0x0000
Diag Control            0x00
Diag Address            0x00
Diag Data               0x00

Related Commands

Command
Description

show controllers sca

Displays if the packet priority is configured as unicast or multicast. If the priority is configured as multicast then the output of the show controllers sca command displays "Config 0x00 pri-mcast" and if the priority is configured as unicast then the command output displays "Config 0xC0 unicast-accept-mode pri-alternating".


Glossary

DSCP

Differentiated Services Code Point. In Multicast Egress QoS, the DSCP value specifies the QoS. The first 3 bits of the Type of Service (TOS) field in an IP packet indicate the precedence value, a value of 0-7. The first 6 bits of the Type of Service (TOS) field in an IP packet indicate the DSCP value, a value of 0-63. Since the DSCP field overlaps the precedence field by 3 bits, few DSCP values match precedence value. For example: the DSCP values 8-15 are equivalent to the precedence values 1 (001XXX).

MGID

The Multicast Identifier (MGID) is the multicast group identifier (ID) that holds the list of the default queues for the interfaces to which the multicast stream is replicated. The local MGID is the identifier that holds the list of the different queues (default or non-default) that the stream should be replicated to. Each MGID is associated with a DSCP value.

midb

Multicast Identifier Descriptor Block

mroute

Multicast route.

precedence

The first 3 bits of the Type of Service (TOS) field in an IP packet indicate the precedence value, a value of 0-7. Precedence indicates the priority level of the packet.

VGL

VLAN group level

VRF

A Virtual Private Network (VPN) routing/forwarding instance.

WRED

Weighted Random Early Detection. Queueing method that ensures that high-precedence traffic has lower loss rates than other traffic during times of congestion.