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This chapter describes the Cisco NX-OS commands that begin with H that are used to manage a Cisco Nexus 2000 Series Fabric Extender from a Cisco Nexus 6000 switch.
To limit the amount of input hardware buffer usage for each Fabric Extender, use the hardware buffer-threshold command. To revert to the default and allow a Fabric Extender to use all available hardware buffer space, use the no form of this command.
hardware fex_card_typ buffer-threshold buffer-limit
no hardware fex_card_typ buffer-threshold
None
Fabric extender configuration mode
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6.0(2)N1(1) |
This command was introduced. |
Note This command is supported only on a Cisco Nexus 2148T Fabric Extender.
The Cisco Nexus 2148T Fabric Extender has four 10-Gigabit Ethernet fabric interfaces for its uplink connection to the parent Cisco Nexus 6000 Series switch and 48 1000BASE-T (1-Gigabit) Ethernet host interfaces for its downlink connection to servers or hosts.
The buffer-threshold keyword sets the consumption level of input buffers before an indication is sent to the egress queue to start observing the tail drop threshold. If the buffer usage is lower than the configured buffer threshold, the tail drop threshold is ignored.
This example shows how to configure the hardware buffer threshold limit on a Cisco Nexus 2148T Fabric Extender:
switch(config)# fex 110
switch(config-fex)# hardware N2148T buffer-threshold 163840
switch(config-fex)#
This example shows how to remove the hardware buffer threshold configured on a Cisco Nexus 2148T Fabric Extender:
switch(config)# fex 110
switch(config-fex)# no hardware N2148T buffer-threshold
switch(config-fex)#
To enable the load balancing queues for the Cisco Nexus 2248PQ Fabric Extender, use the hardware N2248PQ uplink-load-balance-mode command. To disable load balancing queues,use the no form of this command.
hardware N2248PQ uplink-load-balance-mode
no hardware N2248PQ uplink-load-balance-mode
This command has no arguments or keywords.
None
Fabric extender configuration mode
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6.0(2)N1(1) |
This command was introduced. |
Note This command is supported only on a Cisco Nexus 2248PQ Fabric Extender.
The Cisco Nexus 2248PQ has 48 10-Gigabit Ethernet host interfaces with SFP+ interface adapters and 16 10-Gigabit Ethernet fabric interfaces corresponding to 4 QSFP interface adapters for its uplink connection to the parent switch.
This example shows how to enable the load balancing queues for a Cisco Nexus 2248PQ Fabric Extender:
switch(config)# fex 100
switch(config-fex)# hardware N2248PQ uplink-load-balance-mode
switch(config-fex)#
This example shows how to disable the load balancing queues for a Cisco Nexus 2248PQ Fabric Extender:
switch(config)# fex 100
switch(config-fex)# no hardware N2248PQ uplink-load-balance-mode
switch(config-fex)#
To control the egress queue tail drop threshold level on a Fabric Extender, use the hardware queue-limit command. To disable the drop threshold and allow a Fabric Extender to use all available hardware buffer space, use the no form of this command.
hardware fex_card_typ queue-limit [queue-limit] [rx | tx]
no hardware fex_card_typ queue-limit [rx | tx]
The default queue-limit for rx (ingress) on a Cisco Nexus 2248TP-E Fabric Extender is 1MB.
The default queue-limit for tx (egress) on a Cisco Nexus 2248TP-E Fabric Extender is 4MB.
Fabric extender configuration mode
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6.0(2)N1(1) |
This command was introduced. |
You can use a lower queue limit value on the Fabric Extender to prevent one blocked receiver from affecting traffic being sent to other noncongested receivers (head-of-line blocking); however, this will increase burst absorption on the ingress traffic. A higher queue limit value provides better burst absorption and less head-of-line blocking protection.
Supported Cisco Nexus 2000 Series Fabric Extender
The following Cisco Nexus 2000 Series Fabric Extenders are supported on a Cisco Nexus 6000 Series switch:
•Cisco Nexus 2148T Fabric Extender—It has four 10-Gigabit Ethernet fabric interfaces for its uplink connection to the parent Cisco Nexus switch and 48 1000BASE-T (1-Gigabit) Ethernet host interfaces for its downlink connection to servers or hosts.
•Cisco Nexus N2224TP Fabric Extender—It has two 10-Gigabit Ethernet fabric interfaces with small form-factor pluggable (SFP+) interface adapters for its uplink connection to the parent Cisco Nexus switch and 24 1000BASE-T (1-Gigabit) Ethernet host interfaces for its downlink connection to servers or hosts. It does not support Fibre Channel over Ethernet (FCoE).
•Cisco Nexus 2232P Fabric Extender—It has eight 10-Gigabit Ethernet fabric interfaces with small form-factor pluggable (SFP+) interface adapters for its uplink connection to the parent Cisco Nexus switch and 32 10-Gigabit Ethernet fabric interfaces with SFP+ interface adapters for its downlink connection to servers or hosts.
•Cisco Nexus 2232TM Fabric Extender—It has eight 10-Gigabit Ethernet fabric interfaces with small form-factor pluggable (SFP+) interface adapters for its uplink connection to the parent Cisco Nexus switch and 32 10-Gigabit BASE-T Ethernet fabric interfaces for its downlink connection to servers or hosts.
•Cisco Nexus 2248T Fabric Extender—It has four 10-Gigabit Ethernet fabric interfaces with SFP+ interface adapters for its uplink connection to the parent Cisco Nexus switch and 48 1000BASE-T (1-Gigabit) Ethernet host interfaces for its downlink connection to servers or hosts.
•Cisco Nexus N2248TP-E Fabric Extender—It has four 10-Gigabit Ethernet fabric interfaces for its uplink connection to the parent Cisco Nexus switch and 48 1000BASE-T (1-Gigabit) Ethernet host interfaces with small form-factor pluggable (SFP+) interface adapters for its downlink connection to servers or hosts.
•Cisco Nexus 2248PQ Fabric Extender—It has 48 10-Gigabit Ethernet host interfaces with SFP+ interface adapters and 16 10-Gigabit Ethernet fabric interfaces corresponding to 4 QSFP interface adapters for its uplink connection to the parent switch.
This example shows how to configure the hardware buffer queue limit on a Cisco Nexus 2248T Fabric Extender:
switch(config)# fex 110
switch(config-fex)# hardware N2248T queue-limit 327680
switch(config-fex)#
This example shows how to remove the hardware buffer queue limit configured on a Cisco Nexus 2248T Fabric Extender:
switch(config)# fex 110
switch(config-fex)# no hardware N2248T queue-limit
switch(config-fex)#
To configure the shared buffer size for a Cisco Nexus 2000 Series Fabric Extender, use the hardware shared-buffer-size command. To revert to the default setting, use the no form of this command.
hardware fex_card_type shared-buffer-size [buffer-size]
no hardware fex_card_type shared-buffer-size [buffer-size]
The default size of the shared buffer is 25392KB.
Fabric Extender configuration mode
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6.0(2)N1(1) |
This command was introduced. The Cisco Nexus N2248TP-E Fabric Extender and the Cisco Nexus N2248PQ Fabric Extender were introduced. |
Note This command is supported only on Cisco Nexus 2248TP-E and Cisco Nexus N2248PQ Fabric Extenders.
The Cisco Nexus N2248TP-E Fabric Extender has four 10-Gigabit Ethernet fabric interfaces for its uplink connection to the parent Cisco Nexus switch and 48 1000BASE-T (1-Gigabit) Ethernet host interfaces with small form-factor pluggable (SFP+) interface adapters for its downlink connection to servers or hosts.
The total available buffer is 32MB which is shared in both direction (ingress, egress).
The default size of the shared buffer is 25392KB. However, when configuring an Ethernet-based pause no-drop class, the shared buffer size changes to 10800KB. This change is required to increase the dedicated buffer that supports the pause no-drop class. The pause no-drop class does not use buffer space from the shared-pool.
The Cisco Nexus 2248PQ Fabric Extender has 48 10-Gigabit Ethernet host interfaces with SFP+ interface adapters and 16 10-Gigabit Ethernet fabric interfaces corresponding to 4 QSFP interface adapters for its uplink connection to the parent switch.
This example shows how to configure the hardware buffer size on a Cisco Nexus 2248TP-E Fabric Extender:
switch# configure terminal
switch(config)# fex 100
switch(config-fex)# hardware N2248TTP-E shared-buffer-size 25000
switch(config-fex)#
This example shows how to remove the hardware pause no-drop configuration between a Cisco Nexus 2248TTP-E Fabric Extender and a switch:
switch# configure terminal
switch(config)# fex 100
switch(config-fex)# no hardware N2248TTP-E shared-buffer-size 25000
switch(config-fex)#
To configure a pause no-drop class up to a distance of 3000 meters between the Cisco Nexus 2000 Series Fabric Extender and a Cisco Nexus 6000 switch, use the hardware uplink-pause-no-drop command. To revert to the default setting, use the no form of this command.
hardware fex_card_type uplink-pause-no-drop distance [distance-value]
no hardware fex_card_type uplink-pause-no-drop distance [distance-value]
The default distance between a Fabric Extender and the switch is 300 meters.
Fabric Extender configuration mode
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|
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6.0(2)N1(1) |
This command was introduced. The Cisco Nexus N2248TP-E Fabric Extender and the Cisco Nexus N2248PQ Fabric Extender were introduced. |
Note This command is supported only on Cisco Nexus 2248TP-E and Cisco Nexus N2248PQ Fabric Extenders.
The Cisco Nexus N2248TP-E Fabric Extender has four 10-Gigabit Ethernet fabric interfaces for its uplink connection to the parent Cisco Nexus switch and 48 1000BASE-T (1-Gigabit) Ethernet host interfaces with small form-factor pluggable (SFP+) interface adapters for its downlink connection to servers or hosts.
The Cisco Nexus 2248PQ Fabric Extender has 48 10-Gigabit Ethernet host interfaces with SFP+ interface adapters and 16 10-Gigabit Ethernet fabric interfaces corresponding to 4 QSFP interface adapters for its uplink connection to the parent switch.
This example shows how to configure the hardware pause no-drop class up to a distance of 3000 meters between a Cisco Nexus 2248TTP-E Fabric Extender and a switch:
switch# configure terminal
switch(config)# fex 100
switch(config-fex)# hardware N2248TTP-E pause-no-drop distance 3000
switch(config-fex)#
This example shows how to remove the hardware pause no-drop configuration between a Cisco Nexus 2248TTP-E Fabric Extender and a switch:
switch# configure terminal
switch(config)# fex 100
switch(config-fex)# no hardware N2248TTP-E pause-no-drop distance 3000
switch(config-fex)#