show forwarding configuration

Description

Displays the configured selection criteria for ECMP (Equal Cost Multi Paths) routes and load-sharing group ports and the hardware table settings, including the configured and current hash algorithm and dual-hash settings.

Syntax Description

This command has no arguments or variables.

Default

N/A.

Usage Guidelines

The output of this command displays the following information:

Configured hash algorithm—The hash algorithm configured on the switch. After the configuration is saved and the switch is rebooted, the switch uses this hash algorithm.
Current hash algorithm—The hash algorithm currently used by the switch.
Configured dual-hash setting—Whether the dual-hash feature is configured ‘on‘ or ‘off‘ on the switch. After the configuration is saved and the switch is rebooted, the switch uses this setting.
Current dual-hash setting—Whether the dual-hash feature is currently ‘on‘ or ‘off‘ on the switch.
Dual-Hash recursion level—The current dual-hash recursion level; default is ‘1.‘
Sharing criteria—Current selection criterion used for ECMP route sharing as well as for load-sharing groups. Specifies which Layer 3 and Layer4 information is used in the sharing hash algorithm. For more information, see the description for the configure forwarding sharing [L3 | L3_L4] command.
Group Table Compression—Whether the group table compression is currently ‘on‘ or ‘off‘ on the switch.
Switching mode—Whether the switching mode is currently set to ‘cut-through‘ or ‘store-and-forward.‘
Fabric flow control—Whether flow control fabric configuration is set to ‘auto‘ or ‘off.‘

It is possible for the values of the configured and the current hash, or the configured and current dual-hash settings to be different. For example, if you modified the hash algorithm and have not saved the configuration and rebooted the switch, the values might be different. In this situation, the switch also displays the following message:

 NOTE: A save and reboot are required before the configured hash will take effect

Example

The following command displays the hardware forwarding algorithm configured on the switch:

show forwarding configuration


L2 and L3 Forwarding table hash algorithm:
    Configured hash algorithm:              crc32
    Current hash algorithm:                 crc32

L3 Dual-Hash configuration:
    Configured setting:                     on
    Current setting:                        on
    Dual-Hash Recursion Level:              1

Hash criteria for IP unicast traffic for L2 load sharing and ECMP route sharing
    Sharing criteria:                       L3_L4

IP multicast:
    Group Table Compression:                on
    Local Network Forwarding:               slow-path
    Lookup-Key:                             (SourceIP, GroupIP, VlanId)

Internal lookup tables:
    Configured Setting:                     l2-and-l3
    Current Setting:                        l2-and-l3

Switch Settings:
    Switching mode:                         store-and-forward

L2 Protocol:
    Fast convergence:                       on

Rate Limit:
    Overhead Bytes:                         20

Fabric Flow Control:
    Fabric Flow Control:                    auto

ARP and ND Settings:
    ARP Suppression Filters:                per-port
    ND Suppression Filters:                 per-port

VPEX Settings:
    VLAN Port Membership:                   hash-table

History

This command was first available in ExtremeXOS 11.3.2.

The flow control feature was added in ExtremeXOS 12.5.

The Forwarding Lookup-Key feaure show output is added in ExtremeXOS 15.3.

VPEX setting for VLAN port membership was added in ExtremeXOS 22.6.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.

Published January 2019prev | next

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