Brocade TurboIron 24X Series Configuration Guide - Manual (Page 486)

452 Brocade TurboIron 24X Series Configuration Guide
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Configuring IP parameters – Layer 3 Switches
Router A is connected to Router B as a point-to-point link with 10.1.1.0/31 subnet. There are only
two available addresses in this subnet, 10.1.1.0 on Router A and 10.1.1.1 on Router B,
Routers B and C are connected by a regular 24-bit subnet. Router C can either be a switch with
many hosts belonging to the 10.2.2.2/24 subnet connected to it, or it can be a router.
Router A
RouterA(config)#interface ethernet 1/1/1
RouterA(config-if-e1000-1/1/1)#ip address 10.1.1.0/31
Router B
RouterB(config)#interface ethernet 1/1/1
RouterB(config-if-e1000-1/1/1)#ip address 10.1.1.1/31
RouterB(config-if-e1000-1/1/1)#exit
RouterB(config#inteface ethernet 1/3/1
RouterB(config-if-e1000-1/3/1)#ip address 10.2.2.1/24
Router C
RouterC(config#inteface ethernet 1/3/1
RouterC(config-if-e1000-1/3/1)#ip address 10.2.2.2/24
Displaying information for a 31-bit subnet mask
Use the following commands to display information for the 31-bit subnet mask:
• show run interface
• show ip route
• show ip cache
Configuring packet parameters
You can configure the following packet parameters on Layer 3 Switches. These parameters control
how the Layer 3 Switch sends IP packets to other devices on an Ethernet network. The Layer 3
Switch always places IP packets into Ethernet packets to forward them on an Ethernet port.
• Encapsulation type – The format for the Layer 2 packets within which the Layer 3 Switch sends
IP packets.
• Maximum Transmission Unit (MTU) – The maximum length of IP packet that a Layer 2 packet
can contain. IP packets that are longer than the MTU are fragmented and sent in multiple
Layer 2 packets. You can change the MTU globally or an individual ports:
• Global MTU – The default MTU value depends on the encapsulation type on a port and is
1500 bytes for Ethernet II encapsulation and 1492 bytes for SNAP encapsulation.
• Port MTU – A port default MTU depends on the encapsulation type enabled on the port.