48 lines
1.7 KiB
Text
48 lines
1.7 KiB
Text
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Virtual eXtensible Local Area Networking documentation
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======================================================
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The VXLAN protocol is a tunnelling protocol that is designed to
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solve the problem of limited number of available VLAN's (4096).
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With VXLAN identifier is expanded to 24 bits.
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It is a draft RFC standard, that is implemented by Cisco Nexus,
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Vmware and Brocade. The protocol runs over UDP using a single
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destination port (still not standardized by IANA).
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This document describes the Linux kernel tunnel device,
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there is also an implantation of VXLAN for Openvswitch.
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Unlike most tunnels, a VXLAN is a 1 to N network, not just point
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to point. A VXLAN device can either dynamically learn the IP address
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of the other end, in a manner similar to a learning bridge, or the
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forwarding entries can be configured statically.
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The management of vxlan is done in a similar fashion to it's
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too closest neighbors GRE and VLAN. Configuring VXLAN requires
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the version of iproute2 that matches the kernel release
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where VXLAN was first merged upstream.
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1. Create vxlan device
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# ip li add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth1
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This creates a new device (vxlan0). The device uses the
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the multicast group 239.1.1.1 over eth1 to handle packets where
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no entry is in the forwarding table.
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2. Delete vxlan device
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# ip link delete vxlan0
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3. Show vxlan info
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# ip -d link show vxlan0
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It is possible to create, destroy and display the vxlan
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forwarding table using the new bridge command.
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1. Create forwarding table entry
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# bridge fdb add to 00:17:42:8a:b4:05 dst 192.19.0.2 dev vxlan0
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2. Delete forwarding table entry
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# bridge fdb delete 00:17:42:8a:b4:05 dev vxlan0
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3. Show forwarding table
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# bridge fdb show dev vxlan0
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