Figure 6- 125. DNS Relay Static Settings and Table window
To add an entry into the
DNS Relay Static Tabl
e, simply enter a
Domain Name
with its corresponding IP address and click
Add
.A successful entry will be
presented in the table below, as shown in the example above.To erase an entry from the table, click the corresponding
8
of the entry you wish to delete.
VRRP
VRRP
or
Virtual Routing Redundancy Protocol
is a function on the Switch that dynamically assigns responsibility for a virtual router to one of the VRRP routers on a
LAN.The VRRP router that controls the IP address associated with a virtual router is called the Master, and will forward packets sent to this IP address.This will
allow any Virtual Router IP address on the LAN to be used as the default first hop router by end hosts. Utilizing VRRP, the administrator can achieve a higher
available default path cost without needing to configure every end host for dynamic routing or routing discovery protocols.
Statically configured default routes on the LAN are prone to a single point of failure.VRRP is designed to eliminate these failures by setting an election protocol
that will assign a responsibility for a virtual router to one of the VRRP routers on the LAN.When a virtual router fails, the election protocol will select a virtual
router with the highest priority to be the Master router on the LAN.This retains the link and the connection is kept alive, regardless of the point of failure.
To configure VRRP for virtual routers on the Switch, an IP interface must be present on the system and it must be a part of a VLAN.VRRP IP interfaces may be
assigned to every VLAN, and therefore IP interface, on the Switch.VRRP routers within the same VRRP group must be consistent in configuration settings for this
protocol to function optimally.
VRRP Configuration
To enable VRRP globally on the Switch, click
Configuration > Layer 3 IP Networking > VRRP > VRRP Global Settings
:
Figure 6- 126.VRRP Global Settings window
The following fields can be set:
Parameter
Description
Global VRRP
Use the pull-down menu to enable or disable VRRP globally on the Switch.The default is
Disabled
.
Non-owner response PING
Enabling this parameter will allow the virtual IP address to be pinged from other host end nodes to verify
connectivity.This will only enable the ping connectivity check function.This command is Disabled by default.
Click
Apply
to implement changes made.
125
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch