Allied Telesis z AT-8700XL Series, User Manual, Page: 69 / 81

Switching 69
Software Release 2.6.1
C613-02030-00 REV B
The spanning tree algorithm ensures that the extended LAN contains no loops
and that all LANs are connected by:
■
Detecting the presence of loops and automatically computing a logical
loop-free portion of the topology, called a
spanning tree . The topology is
dynamically pruned to a spanning tree by declaring the ports on a switch
redundant, and placing the ports into a ‘Blocking’ state.
■
Automatically recovering from a switch failure that would partition the
extended LAN by reconfiguring the spanning tree to use redundant paths,
if available.
Spanning Tree and Rapid Spanning Tree Port States
If STP is running in STANDARD mode, then each port can be in one of five
Spanning Tree states, and one of two switch states. If STP is running in RAPID
mode, then each port can be in one of four states. The state of a switch port is
taken into account by STP. To be involved in STP negotiations, STP must be
enabled on the switch, the port must be enabled on the switch, and enabled for
the STP it belongs to.
IP Switching
The switch performs IP routing at wire speed between VLANs that have been
configured as IP interfaces. For example, to add the admin VLAN as an IP
interface, giving it an IP address of 192.168.163.39 in the subnet 192.168.163.0,
first enable IP using the command:
ENABLE IP
Then use either of the following commands:
ADD IP INTERFACE=vlan-admin IPADDRESS=192.168.163.39
MASK=255.255.255.0
ADD IP INTERFACE=vlan11 IPADDRESS=192.168.163.39
MASK=255.255.255.0
The command:
SHOW IP INTERFACE
displays the interfaces enabled for IP routing (Figure 12).
For detailed information about configuring IP, see the Internet Protocol (IP)
chapter in the AT-8700XL Series Software Reference.
Figure 12: Example output from the SHOW IP INTERFACE command.
Interface Type IP Address Bc Fr PArp Filt RIP Met. SAMode IPSc
Pri. Filt Pol.Filt Network Mask MTU VJC GRE OSPF Met. DBcast Mul.
--------------------------------------------------------------------------------
LOCAL - Not Set - n - --- - - --
--- ---- - - - --- - - ---
vlan11 Static 192.168.163.39 1 y On --- 01 Pass --
--- --- 255.255.255.0 1500 - --- 0000000001 No On
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