jumbo frame la gi

cấu hình MTU và Jumbo Frame mang lại switch Dell Force10 S4810https://www.force10networks.com/CSPo…-settings.aspxAdjusting MTU and Configuring Jumbo Frame Settings Overview This tech tip explains the function of different Maximum Transmission Unit (MTU) settings in FTOS. Also, it provides an example of configuring jumbo frames and adjusting MTU settings. MTU and IP MTU Settings FTOS uses: MTU settings to lớn determine whether or not to lớn fragment a packetIP MTU settings to lớn phối the packet fragment size The difference between the MTU and IP MTU settings should be equal to lớn the Ethernet header and footer size (18 bytes for untagged ports and 22 bytes for tagged ports). FTOS automatically sets the IP MTU equal to lớn the MTU less 18 bytes (IP MTU = MTU – 18 bytes) when you configure a MTU setting. If you use a tagged port, the user needs to lớn phối the IP MTU equal to lớn the MTU less 22 bytes (IP MTU = MTU – 22 bytes). Port Type IP MTU Calculation Untagged Port IP MTU = MTU – 18 bytes Tagged Port IP MTU = MTU – 22 bytes Example If you phối the MTU to lớn 9000 for an untagged port, you should phối the IP MTU should be phối to lớn 8982 (MTU – 18 bytes). (FTOS configures this automatically.) If MTU is phối to lớn 9000 for a tagged port, the IP MTU should be phối to lớn 8978 (MTU – 22 bytes). (You must configure this value.) For port channel and VLAN interfaces, all thành viên ports should have the same MTU and IP MTU values. If you configure the MTU and IP MTU on a port-channel or VLAN interface, FTOS does not configure MTU and IP MTU on the thành viên ports automatically. You must configure them for the individual members. If the VLAN or port channel is a Layer 3 interface (if you assign the IP address), then you should configure the MTU and IP MTU on those interfaces. The OSPF, BGP, IS-IS and the IP Stack use these configured values. Devices on the same physical subnet should have the same MTU and IP MTU settings to lớn ensure the proper operation of the protocol. For Jumbo frame purposes, FTOS sets an interface’s Maximum Receive Unit (MRU) size equal to lớn the MTU value you configured for the interface (MRU = MTU). Force10 TAC is aware that other vendors implement MTU differently. For more information about your situation, please consult your vendor’s documentation. Example Configuration Here is a sample configuration you can use to lớn phối up MTU and IP MTU settings to lớn work with Jumbo frames: 1) Allcurrently shipping Force10line cardsand RPMs supportJumboframes. On the E-Series and C-Series, you can verify that your RPMs and line cards tư vấn Jumbo frames by using the show linecard and show rpm commands to lớn inspect the Jumbo Capable field for the value “yes”, as shown below. On the S-Series, see the Jumbo Capable field in the output of the command show system stack-unit. Force10# show rpm — RPM thẻ 0 — Status : active Next Boot : online Card Type : RPM – Route Processor Module (LC-EF-RPM) Hardware Rev : 2.0 Num Ports : 1 Up Time : 36 min, 51 sec Last Restart : reset FTOS Version : 6.2.1.0 Jumbo Capable : yes —

————— 2) Allcurrently shipping Force10 chassis tư vấn Jumboframes. Some E-Series using EtherScale architecture vì thế not by mặc định. To kiểm tra if your E-Series is Jumbo-enabled, use the show chassis

command: Force10# show chassis— Manufacturing Info — Chassis Type : E1200Chassis Mode : TeraScale —

————— Your Chassis Mode must be phối to lớn anything but “Non Jumbo”. Note

: You can also inspect the Jumbo capability of the RPMs in the output of this command. 3) Check current MTU settings: Force10# show interfaces gigabitethernet0/0GigabitEthernet 0/0 is down, line protocol is down Hardware is Force10Eth, address is 00:01:e8:05:ae:e5 Internet address is not phối MTU 1554 bytes, IP MTU 1500 bytes LineSpeed tự động, Mode full duplex ARP type: ARPA, ARP Timeout 04:00:00 4) Configure interface MTU/IP MTU: Force10# configure Force10(conf)# interface gigabitethernet 0/0 Force10(conf-if-gi-0/0)# mtu 9252Force10(conf-if-gi-0/0)# ip mtu 9234 Force10(conf-if-gi-0/0)# show config ! interface GigabitEthernet 0/0no ip addressmtu 9252ip mtu 9234shutdownForce10(conf-if-gi-0/0)#Force10# 5) Verify new settings: Force10#show interfaces gigabitethernet0/0GigabitEthernet 0/0 is down, line protocol is downHardware is Force10Eth, address is 00:01:e8:05:ae:e5Internet address is not setMTU 9252 bytes, IP MTU 9234 bytesLineSpeed tự động, Mode full duplexARP type: ARPA, ARP Timeout 04:00:00