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Linux Bridging: Teaching an old dog new tricks
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Linux Bridging: Teaching an old dog new tricks
1.
Linux Bridging Teaching an
Old Dog New Tricks Stephen Hemminger shemminger@vyatta.com
2.
Topics ●
Background ● Tunneling ● Security ● Status
3.
Bridge History 1985
1990 1998 2000 2001 2004 2005 2012 Ethernet IEEE IEEE IEEE RSTP Bridging 802.1d 802.1d 802.1d MSTP SPB Invented 1998 2004 802.1s 802.1aq Linux IGMP Bridge Snooping
4.
Bridge Forwarding
Flood Multicast? Destination? Output IGMP table Forwarding Table
5.
Spanning Tree Protocol
Root Leaf BPDU BPD Disabled U Edge
6.
7.
Tunnels
VXLAN1 VXLAN2 Bridge1 Bridge2 Bridge1 Bridge2 Guest Guest Guest Guest A B C D
8.
Cloud Tunneling Protocols ●
VxLan – Arista, Broadcom, Cisco, Vmware, Red Hat ● NVGRE – Microsoft, Intel, Dell, Broadcom, Emulex ● STT – Niciria
9.
API flavor's ●
Ioctl – Compatibility – non-extensible ● Sysfs – Text based ● Netlink – Notifications – TLV format
10.
Hw offload ●
Common netlink API – Forwarding table – monitoring
11.
Security ●
BPDU guard ● BPDU filter ● Root port protect ● Port locking
12.
STP Security Issues
Bridge (core) Bridge (core) Bridge (edge) Guest VM
13.
BPDU Filter
Core Bridge BPDU blocked Not sent or received BPDU Untrusted Host
14.
BPDU Guard
Core Bridge Rogue BPDU! Link disabled BPDU BPDU Untrusted Host/Bridge
15.
Root Port Protect
BPDU Core Bridge Allowed if Priority < Root BPDU BPDU Semi-trusted Host/Bridge
16.
Port lock
Source Address Core Bridge Must match Untrusted Guest
17.
Spanning Tree ●
Current – Kernel – 802.1d 1998 – Userspace – RSTP daemon ● Goal – Kernel – 802.1d/802.1s – Userspace – SPB or TRILL?
18.
Status ●
VXLAN – 3.7 ● Security – 3.8? ● STP update – 3.9??
19.
Bridge vs Openvswitch Ethernet
Bridge Openvswitch – Plug and Play – Table driven – Firewall rules – Flexible – Integrated – Management agent
20.
Thank you
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