Dell S3100 Command Line Reference Guide for the Series 9.112.1 - Page 793
ip name-server
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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. For 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 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. For 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. The following describes the difference between Link MTU and IP MTU. Layer 2 Overhead Difference between Link MTU and IP MTU Ethernet (untagged) 18 bytes VLAN Tag Tag 22 bytes Untagged Packet with VLAN-Stack Header 22 bytes Tagged Packet with VLAN-Stack Header 26 bytes Related Commands • mtu - set the link MTU for an Ethernet interface. ip name-server Enter up to six IPv4 addresses of name servers. The order you enter the addresses determines the order of their use. Syntax Parameters ip name-server ipv4-address [ipv4-address2...ipv4-address6] To remove a name server, use the no ip name-server ip-address command. ipv4-address ipv4-address2... ipv4-address6 Enter the IPv4 address, in dotted decimal format, of the name server to be used. (OPTIONAL) Enter up five more IPv4 addresses, in dotted decimal format, of name servers to be used. Separate the addresses with a space. IPv4 Routing 793
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