known as “jumbo frames”. Typically, these are 9000 bytes, although some vendors do support a larger size. Using frames this large mitigates the number of packets that must be processed by a factor of 6. So rather than processing 1.6 million packets per second, a CPU need only process 266,666 packets. This reduces the number of iterations ...

The often overlooked purpose of jumbo frames is to reduce the CPU overhead of making and reassembling packets. This benefit can vary a substantially from one machine to the next, servers with fancy task offloading network cards don't see any …

2009年6月18日 · Jumbo frames are frames larger than the standard Ethernet frame size of 1518 bytes, which includes the Layer 2 header and Frame Check Sequence (FCS). In other words, jumbo frames refer to Ethernet packets of up to 9000 bytes in size. In Catalyst 4500 series switches, the Supervisor III and IV can handle packets up to a maximum size of 9198 bytes.

2008年8月21日 · Jumbo frames can be problematic at the best of times - if you are using UDP multicast with jumbo then you'll need to be 100% sure that the sources, destinations, and every possible path between them is also jumbo enabled. By default jumbo is disabled on all ethernet blades (default mtu is 1500) but can be changed using the mtu command.

2023年4月21日 · Jumbo packets, if corrupted, have bigger impact (whole, larger, packet needs to be resent). In theory, corrupted larger packets are more likely to slip past packet/frame validation w/o detection (not a huge risk increase, at least for an Ethernet frame's FCS).

2017年1月24日 · If, on a 2960X, you enable jumbo globally, it doesn't mean all your VLANs have to actually use it, just that they all will accept a jumbo frame. If that's unacceptable, perhaps some kind of ACL could block jumbo frames on VLANs or ports you don't want to allow. I don't recall all what switches might limit jumbos per VLAN, per jumbo configuration.

2013年11月10日 · As stated above there is a lot of information about Jumbo Frames with the NetApp and UCS with conflicting configurations. We found our original docs used and it had conflicting settings in it as well. However, if you do as mentioned above use the FlexPod reference design it does state to use 9216 for your settings.

2012年1月25日 · 3) If jumbo frames support is configured on switch but the egress port towards an 1841 router is 100MB , I understand the frames will get dropped. Is there any way to solve this issue. If the link to the router is upgraded to gigabit will the frame pass thru the egress port to the router ? will the router fragement and route it onward ?

2009年9月9日 · An ethernet frame Jumbo or Not is comprised of payload, header and crc. If you are running 802.1q VLAN trunking then that frame has payload, header, tag and CRC. When someone refers to 9000 byte jumbo frames, they are typically talking about the payload. When you set the MTU on a Windows, Unix, Storage array or any endpoint.

2016年10月20日 · Does anyone know if you can enable Jumbo frames on a per VLAN basis for a Cisco 3850 switch? Exact model is WS-C3850-24T-S. Documentation online seems to suggest you can only change only the system MTU and not the per interface MTU.