Additional sections:
In this section:
The Link Detection Group (LDG) object allows you to group interfaces and associated Link Monitors together and track link verification failures within the group. A LDG will be configured with a unique name and a failover threshold. The LDG tracks the number of link verification failures that have occurred among the Link Monitors configured.
In addition to a Failover Threshold, a Link Detection Group can also be configured with values for the verifyTimer, responseTimer, reattemptTimer and retries. These values will be used for each Link Monitor belonging to the group, unless that Link Monitor is configured with its own unique values for these fields.
Link detection failure alarms are generated by Link Verification Manager (LVM) and are raised only when LDG is configured. NRS generated alarms are raised regardless of whether LDG is configured.
If no LDG is configured on the management ports, then
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allows manual switch-overs.Command Syntax
% set addressContext <addressContext_name> linkDetectionGroup <linkdetectionGroup_name> ceName <ceName_name> linkMonitor <linkMonitor_name> reattemptTimer <300-10000> responseTimer <500-10000> retries <1-10> state <disabled | enabled> threshold <0-10> type <ip | mgmt> verifyTimer <1000-60000> % show addressContext <addressContext_name> linkDetectionGroup <linkDetectiongroup_name> displaylevel <displaylevel> ceName <ceName_name> linkMonitor <linkMonitor> reattemptTimer <300-10000> responseTimer <500-10000> retries <1-10> state <disabled | enabled> threshold <0-10> type <ip | mgmt> verifyTimer <1000-60000> % delete addressContext <addressContext_name> linkDetectionGroup <linkDetectionGroup_name>
Command Parameters
Link Detection Group Parameters
Parameter | Length/Range | Description |
|---|---|---|
| N/A |
|
| 1-23 | The name of the computing element (CE) that hosts this link detection group. 'ceName' is not the system name. For an HA system, link detection needs to be setup on both CEs. |
| N/A |
|
| 300-10000 | Time (in milliseconds) to wait for a link verification reattempt. (default = 1000). |
| 500-10000 | Time (in milliseconds) to wait for a link verification attempt. (default = 500). |
| 1-10 | Specifies the number of retries before link verification is considered failed. (default = 3). |
| N/A | Administrative state of the Link Detection Group.
|
| 0-10 | The number of link monitor failures that will trigger this link detection group to declare a failure and attempt a switchover to the standby server (default = 2). A value of "0" disables fault reporting and the switchover is attempted. When a nonzero threshold value is specified for a standby module, the number of link failures present must be less than that value in order for that module to be activated by a switchover. When threshold is greater the number of link failures, a switchover is not attempted. |
| N/A | The interface type supported by this link detection group.
|
| 1000-60000 | Time interval between link verification attempts representing the frequency at which an ICMP echo request is sent (default = 1000). |
| 1-64 | To display different levels of output information in show commands. |
Command Examples
To display the configuration of all link detection parameters:
Management Link Detection Group
% show addressContext default linkDetectionGroup a1_mgmt_ldg
ceName sbx48.eng.sonusnet.com;
type mgmt;
threshold 1;
verifyTimer 1000;
responseTimer 500;
reattemptTimer 300;
retries 2;
state enabled;
linkMonitor mgmt1_lm {
interfaceGroup mgmtGroup;
interface mgmtIntf1;
destination 10.9.16.162;
verifyTimer 1000;
responseTimer 500;
reattemptTimer 300;
state enabled;
}
linkMonitor mgmt2_lm {
interfaceGroup mgmtGroup;
interface mgmtIntf2;
destination 10.9.16.238;
verifyTimer 1000;
responseTimer 500;
reattemptTimer 300;
state enabled;
}
% show addressContext default linkDetectionGroup pkt0_ldg48
ceName sbx48.eng.sonusnet.com;
type ip;
threshold 1;
verifyTimer 1000;
responseTimer 500;
reattemptTimer 300;
retries 2;
state enabled;
linkMonitor pkt0_lm {
interfaceGroup IFG-INT;
interface lif_eth1;
destination 10.9.48.87;
verifyTimer 1000;
responseTimer 500;
reattemptTimer 300;
state enabled;
}
linkMonitor pkt0_lm2 {
interfaceGroup IFG-INT;
interface lif_eth1;
destination 10.128.45.35;
verifyTimer 1000;
responseTimer 500;
reattemptTimer 300;
state enabled;
}
The show command will only show values that you have changed, and show details command will show all attributes. For example, to display the complete details of all link detection parameters:
% show details addressContext a1 linkDetectionGroup
linkDetectionGroup LDG-A1 {
ceName sbx39.eng.sonusnet.com;
type ip;
threshold 1;
verifyTimer 15000;
responseTimer 1000;
reattemptTimer 300;
retries 2;
state enabled;
linkMonitor LM-A1 {
interfaceGroup IFG-INT;
interface lif_eth1;
destination 10.9.48.87;
verifyTimer 15000;
responseTimer 1000;
reattemptTimer 1000;
state enabled;
}
linkMonitor LM1-A1 {
interfaceGroup IFG-INT;
interface lif_eth1;
destination 10.9.48.165;
verifyTimer 15000;
responseTimer 1000;
reattemptTimer 1000;
state enabled;
}
}
To display the link detection group statistics:
> show table addressContext default linkDetectionGroupStatistics
SINGLE DOUBLE
NAME FAILURES FAILURES FAILURES
-------------------------------------------
pkt0_ldg39 0 0 0
pkt0_ldg48 0 0 0
a1_mgmt_ldg 0 0 0
a2_mgmt_ldg 0 0 0
To display the link detection group status:
> show table addressContext default linkDetectionGroupStatus NAME FAILURES ----------------------- pkt0_ldg39 0 pkt0_ldg48 0 a1_mgmt_ldg 0 a2_mgmt_ldg 0 [ok][2011-06-14 11:26:27
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