HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 450
Enabling Jumbo Frames To Increase Mirroring Path MTU, Table B-2., Maximum Frame Sizes for Mirroring
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Monitoring and Analyzing Switch Operation Traffic Mirroring Enabling Jumbo Frames To Increase Mirroring Path MTU On 1 Gbps and 10 Gbps ports in the mirroring path, you can reduce the number of dropped frames by enabling jumbo frames on all intermediate switches and routers. (The maximum transmission unit-MTU-on the switches covered by this manual is 9220 bytes for frames having an 802.1Q VLAN tag, and 9216 bytes for untagged frames.) For information on configuring the switch for jumbo frames, refer to "Configuring Jumbo Frame Operation" on page 12-4. Table B-2. Maximum Frame Sizes for Mirroring Frame Type Configuration Maximum VLAN Frame Mirrored Frame Tag to Local Port Size Data Untagged Non-Jumbo (default config.) 1518 0 1518 Jumbo1 on All VLANs 9216 0 9216 Jumbo1 On All But 1518 0 n/a2 Source VLAN Non-Jumbo 1522 4 1522 Tagged Jumbo1 on All VLANs 9220 4 9218 Jumbo1 On All But 1522 4 n/a2 Source VLAN 1Jumbo frames are allowed on ports operating at or above 1 Gbps. 2For local mirroring, a non-Jumbo configuration on the source VLAN dictates an MTU of 1518 bytes for untagged frames, and an MTU of 1522 for tagged frames, regardless of the Jumbo configuration on any other VLANs on the switch. B-43
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