Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 446
Port-pipes, Port Channels
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www.dell.com | support.dell.com Link MTU and IP MTU considerations for port channels and VLANs are as follows. Port Channels: • All members must have the same link MTU value and the same IP MTU value. • The port channel link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the channel members. Example: If the members have a link MTU of 2100 and an IP MTU 2000, the port channel's MTU values cannot be higher than 2100 for link MTU or 2000 bytes for IP MTU. VLANs: • All members of a VLAN must have the same IP MTU value. • Members can have different Link MTU values. Tagged members must have a link MTU 4 bytes higher than untagged members to account for the packet tag. • The VLAN link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the VLAN members. Example: The VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged members with Link MTU of 1518 and IP MTU of 1500. The VLAN's Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes. Port-pipes A port pipe is a Dell Force10 specific term for the hardware path that packets follow through a system. Port pipes travel through a collection of circuits (ASICs) built into line cards and RPMs on which various processing events for the packets occur. One or two port pipes process traffic for a given set of physical interfaces or a port-set. The E300 only supports one port pipe per slot. On the E1200 and E600 each slot has two port pipes with following specifications: • 48 port line rate cards have two port pipes on the line card • 48 port high density cards have only one port pipe on the line card Note: All references to the E1200 in this section include the E1200i-AC and E1200i-DC. References to E600 include the E600i. For the purposes of diagnostics, the major difference between the E-Series platforms is the number of port pipes per slot. • E1200 and E600-Each slot has two port-pipes. Each portpipe has nine 3.125Gbps channels to the backplane, one to each SFM. • E300-Each slot has one portpipe. Each port-pipe has eight 3.125Gbps channels to the backplane, with four channels to each SFM. 446 | Interfaces
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