Up to eight addresses can be dened for each gateway list in support of ports that are multi-homed. When multiple IP addresses are
congured for a gateway list, the Layer 2 switch inserts the addresses into the discovery packet in a round robin fashion.
Up to 32 gateway lists can be dened for each Layer 2 switch.
To create the conguration indicated in How DHCP Assist works on page 99, enter commands such as the following.
device(config)# dhcp-gateway-list 1 10.95.5.1
device(config)# dhcp-gateway-list 2 10.95.6.1
device(config)# dhcp-gateway-list 3 10.95.1.1 10.95.5.1
device(config)# interface ethernet 2
device(config-if-e1000-2)# dhcp-gateway-list 1
device(config-if-e1000-2)# interface ethernet 8
device(config-if-e1000-8)# dhcp-gateway-list 3
device(config-if-e1000-8)# interface ethernet 14
device(config-if-e1000-14)# dhcp-gateway-list 2
Syntax: dhcp-gateway-list num ip-addr
IPv4 point-to-point GRE tunnels
NOTE
This feature is supported on FCX , ICX 6610, ICX 6450, ICX 6650, ICX 7250, ICX 7450, ICX 7750, and FastIron SX devices
only.
This section describes support for point-to-point Generic Routing Encapsulation (GRE) tunnels and how to congure them on a Brocade
device.
GRE tunnels support includes the following:
• IPv4 over GRE tunnels. IPv6 over GRE tunnels is not supported.
• Static and dynamic unicast routing over GRE tunnels
• Multicast routing over GRE tunnels
• Hardware forwarding of IP data trac across a GRE tunnel.
• Path MTU Discovery (PMTUD)
IPv4 GRE tunnel overview
Generic Routing Encapsulation is described in RFC 2784. Generally, GRE provides a way to encapsulate arbitrary packets (payload
packet) inside of a transport protocol, and transmit them from one tunnel endpoint to another. The payload is encapsulated in a GRE
packet. The resulting GRE packet is then encapsulated in a delivery protocol, then forwarded to the tunnel destination. At the tunnel
destination, the packet is decapsulated to reveal the payload. The payload is then forwarded to its nal destination.
Brocade devices allow the tunneling of packets of the following protocols over an IPv4 network using GRE:
• OSPF V2
• BGP4
• RIP V1 and V2
NOTE
This is not supported on ICX 6450 devices.
IPv4 point-to-point GRE tunnels
FastIron Ethernet Switch Layer 3 Routing
102 53-1003627-04
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