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Configuring DLSw Ethernet Redundancy Using LLC2 Properties
DLSw is a means of tunneling SNA and NetBIOS traffic
over IP networks. To achieve fault tolerance and load sharing, you
can configure Ethernet redundancy and deploy multiple DLSw routers
on the same LAN segment. These redundant routers provide alternate
paths to the destinations and avoid a single point of failure.
When you configure DLSw Ethernet redundancy on
a LAN segment, a master router is selected from a group of DLSw neighbors.
The master router establishes the circuits.
To configure DLSw Ethernet redundancy, include
the redundancy-group statement and define redundancy group
options:
-
llc2 {
-
-
redundancy-group group-number {
-
advertise-interval seconds;
-
-
map {
-
local-mac mac-address remote-mac mac-address;
-
-
preempt hold-time seconds;
-
no-preempt;
-
priority priority;
-
-
track {
-
-
dlsw {
-
destination mac-address priority-cost priority;
-
peer ip-address priority-cost priority;
- }
-
interface interface-name priority-cost priority;
- }
- }
- }
- }
- }
You can include these statement at the following
hierarchy levels:
-
[edit interfaces interface-name unit logical-unit-number family]
-
[edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number family]
You can configure the following redundancy options:
-
redundancy-group group-number—The group to which this router belongs. Specify the group
number, in the range from 0 through 255.
-
advertise-interval—The advertisement interval
of DLSw peers on the network. All routers in the redundancy group
must use the same advertisement interval. Specify the number of seconds,
from 1 through 255. The default is 1 second.
-
map—Map a local peer MAC address to a remote
peer MAC address.
-
local-mac—The local MAC address to be mapped
to a remote destination MAC address.
-
mac-address—The MAC
address. Specify the MAC address as six hexadecimal bytes in one of
the following formats: nn:nn:nn:nn:nn:nn or nnnn .nnnn.nnnn. For example, 0011.2233.4455 or 00:11:22:33:44:55.
-
remote-mac—The remote destination MAC address
to be mapped to a local MAC address.
-
preempt hold-time seconds— Configure the time to wait before a higher-priority backup
router preempts the master router. Specify the number of seconds,
from 0 through 3600. DLSw preemption is 0 by default.
-
no-preempt—Prohibit the preemption of the
master router.
-
priority priority—The
router’s priority for becoming the master router. The router
with the highest priority within the redundancy group becomes the
master. A larger value indicates a higher priority for being elected.
Specify the priority from 1 through 255. The default is 100 (for backup
routers).
-
track —Enable the following
tracking options for the remote peer and the destination peer:
-
dlsw—DLSw protocol.
-
destination mac-address priority-cost priority—The local MAC address and the priority.
Specify the MAC address as six hexadecimal bytes in one of the following
formats: nn:nn:nn:nn:nn:nn or nnnn .nnnn.nnnn. For example, 0011.2233.4455 or 00:11:22:33:44:55. The priority cost is the value subtracted
from the priority value when remote peer connectivity is lost. Specify
a value from 1 through 254.
-
peer ip-address priority-cost priority—The IP address of the remote peer.
The priority cost is the value subtracted from the priority value
when remote peer connectivity is lost. Specify a value from 1 through 254.
-
interface interface-name—The interface name. Include the logical portion of the name,
which corresponds to the logical unit number.
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