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SIP User's Manual
3. Web-Based Management
Parameter
Web/EMS: Prefix Length
[InterfaceTable_PrefixLength]
Description
Defines the Classless Inter-Domain Routing (CIDR)-style
representation of a dotted decimal subnet notation. The
CIDR-style representation uses a suffix indicating the number
of bits which are set in the dotted decimal format (e.g.
192.168.0.0/16 is synonymous with 192.168.0.0 and a subnet
of 255.255.0.0. Defines the number of ‘1’ bits in the subnet
mask (i.e., replaces the standard dotted-decimal
representation of the subnet mask for IPv4 interfaces). For
example: A subnet mask of 255.0.0.0 is represented by a
prefix length of 8 (i.e., 11111111 00000000 00000000
00000000), and a subnet mask of 255.255.255.252 is
represented by a prefix length of 30 (i.e., 11111111 11111111
11111111 11111100).
The prefix length is a Classless Inter-Domain Routing (CIDR)
style presentation of a dotted-decimal subnet notation. The
CIDR-style presentation is the latest method for interpretation
of IP addresses. Specifically, instead of using eight-bit
address blocks, it uses the variable-length subnet masking
technique to allow allocation on arbitrary-length prefixes (refer
to http://en.wikipedia.org/wiki/Classless_InterDomain_Routing for more information).
For IPv4 Interfaces, the prefix length values range from 0 to
31.
Note: Subnets of different interfaces must not overlap in any
way (e.g., defining two interfaces with 10.0.0.1/8 and
10.50.10.1/24 is invalid). Each interface must have its own
address space.
Web/EMS: Gateway
[InterfaceTable_Gateway]
Defines the IP address of the default gateway used by the
device.
Notes:
Web/EMS: VLAN ID
[InterfaceTable_VlanID]
ƒ
Only one default gateway can be defined.
ƒ
The default gateway must be configured on an interface
that includes Media traffic.
ƒ
The default gateway's IP address must be in the same
subnet as the interface address.
ƒ
Apart from the interface with the defined default gateway,
for all other interfaces define this parameter to “0.0.0.0”.
ƒ
For configuring additional routing rules for other interfaces,
use the Routing table (refer to ''Configuring the IP Routing
Table'' on page 60).
Defines the VLAN ID for each interface. Incoming traffic with
this VLAN ID is routed to the corresponding interface, and
outgoing traffic from that interface is tagged with this VLAN
ID.
Notes:
Version 6.0
ƒ
The VLAN ID must be unique for each interface.
ƒ
VLANs are available only when booting the device from
flash. When booting using BootP/DHCP protocols, VLANs
are disabled to allow easier maintenance access. In this
scenario, multiple network interface capabilities are not
available.
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June 2010