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Configuring DLSw Ethernet Redundancy Using LLC2 Properties
To achieve fault tolerance and load sharing, two
or more redundant DLSw routers can be deployed on the same LAN segment
using Ethernet redundancy support. These redundant routers provide
alternate paths to the destinations and avoid a single point of failure.
When DLSw Ethernet redundancy is configured 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:
-
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 peer MAC address to
be mapped to a remote peer MAC address.
-
mac-address—MAC address.
Specify the MAC address as six hexadecimal bytes in one of the following
formats: nnnn.nnnn.nnnn or nn.nn.nn.nn.nn.nn. 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 peer MAC address.
-
preempt hold-time seconds—Configure the time to wait before a higher-priority backup
router can preempt the master router. Specify the number of seconds,
from 0 through 3600. The default is not to implement DLSw preemption.
-
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: nnnn.nnnn.nnnn or nn.nn.nn.nn.nn.nn. 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—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—Interface name. Include the logical portion of the name, which
corresponds to the logical unit number.
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