Configuration of Dynamic Breakout Ports
Breakout cables are suitable for very short links and offer a cost effective way to connect within racks and across adjacent racks.
Breakout enables a 40 Gigabit (Gb) port to be split into four independent and logical 10Gb ports or a 100Gb port to be split into four independent and logical 25Gb ports.
Before you configure breakout ports, connect a 40Gb port to four 10Gb ports or a 100Gb port to four 25Gb ports with one of the following cables:
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Cisco QSFP-4SFP10G
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Cisco QSFP-4SFP25G
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Cisco QSFP-4X10G-AOC
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MPO to breakout splitter cable with QSFP-40G-SR4 and 4 x SFP-10G-SR on the ends
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MPO to breakout splitter cable with QSFP-100G-SR4-S and 4 x SFP-25G-SR-S on the ends
Note |
For the supported optics and cables, see the Cisco Optics-to-Device Compatibility Matrix: |
The 40Gb to 10Gb dynamic breakout feature is supported on the access facing ports of the following switches:
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N9K-C9332PQ
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N9K-C93180LC-EX
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N9K-C9336C-FX2
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N9K-C93360YC-FX2
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N9K-C93216TC-FX2
The 100Gb to 25Gb breakout feature is supported on the access facing ports of the following switches:
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N9K-C93180LC-EX
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N9K-C9336C-FX2
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N9K-C93180YC-FX
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N9K-C93360YC-FX2
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N9K-C93216TC-FX2
Observe the following guidelines and limitations:
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For the Cisco N9K-C9332PQ switch, you can configure ports 1 to 26 as downlink ports. Of those ports, breakout ports can be configured on port 1 to 12 and 15 to 26. Ports 13 and 14 do not support breakout.
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Breakout ports are supported only on downlinks and converted downlinks.
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Starting in Cisco Application Policy Infrastructure Controller (APIC) release 3.2(1), dynamic breakouts (both 100Gb and 40Gb) are supported on profiled QSFP ports on the Cisco N9K-C93180YC-FX switch.
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Starting in Cisco APIC release 4.1(2), dynamic breakouts (both 100Gb and 40Gb) are supported on profiled QSFP ports on the Cisco N9K-C93216TC-FX2 switch.
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Starting in Cisco APIC release 4.1(2), dynamic breakouts (both 100Gb and 40Gb) are supported on profiled QSFP ports on the Cisco N9K-C93360YC-FX2 switch.
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Breakout ports cannot be used for Cisco APIC connectivity.
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Fast Link Failover policies are not supported on the same port with the dynamic breakout feature.
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Breakout subports can be used in the same way other port types in the policy model are used.
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When a port is enabled for dynamic breakout, other policies (expect monitoring policies) on the parent port are no longer valid.
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When a port is enabled for dynamic breakout, other EPG deployments on the parent port are no longer valid.
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A breakout sub-port can not be further broken out using a breakout policy group.
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If the LACP transmit rate on port channels that have breakout sub-ports need to be changed, then all the port channels that include breakout sub-ports need to use the same LACP transmit rate configuration. You can configure an override policy to set the transmit rate as follows:
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Configure/change the default port channel member policy to include Fast Transmit Rate (
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Configure all the PC/vPC interface policy groups to include the above default port channel member policy under the override policy groups (
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