All MIBs › CISCO-VPDN-MGMT-EXT-MIB › cvpdnSessionSentZLB
cvpdnSessionSentZLB
Module: CISCO-VPDN-MGMT-EXT-MIB
OID (symbolic): CISCO-VPDN-MGMT-EXT-MIB::cvpdnSessionSentZLB
OID (numeric): 1.3.6.1.4.1.9.10.51.1.2.1.1.10
Node type: OBJECT-TYPE
Type: Counter32
Access: read-only
Description: This object returns the total number of Zero Length Body acknowledgement packets transmitted on this session.
What is cvpdnSessionSentZLB?
This counter tracks how many Zero Length Body (ZLB) acknowledgement packets this router has transmitted on the VPDN session to acknowledge received sequence numbers without carrying payload. A rising count is normal maintenance traffic for a sequenced tunnel session, but administrators can use it to confirm the session is actively acknowledging traffic rather than being idle or broken. For example, on an L2TP session with sequencing enabled, a steadily increasing ZLB-sent count alongside no matching data traffic indicates the tunnel is up but currently carrying only acknowledgements.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.9.10.51.1.2.1.1.10 snmpwalk -v2c -c public <target> CISCO-VPDN-MGMT-EXT-MIB::cvpdnSessionSentZLB
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.9.10.51.1.2.1.1.10.1 snmpget -v2c -c public <target> CISCO-VPDN-MGMT-EXT-MIB::cvpdnSessionSentZLB.1
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OID Breakdown
Upper-level ancestors (8 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.9 | cisco | CAT2600-MIB |
| 1.3.6.1.4.1.9.10 | ciscoExperiment | CISCO-SMI |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.9.10.51 | ciscoVpdnMgmtExtMIB | CISCO-VPDN-MGMT-EXT-MIB |
| 1.3.6.1.4.1.9.10.51.1 | ciscoVpdnMgmtExtMIBObjects | CISCO-VPDN-MGMT-EXT-MIB |
| 1.3.6.1.4.1.9.10.51.1.2 | cvpdnSessionExtInfo | CISCO-VPDN-MGMT-EXT-MIB |
| 1.3.6.1.4.1.9.10.51.1.2.1 | cvpdnSessionExtTable | CISCO-VPDN-MGMT-EXT-MIB |
| 1.3.6.1.4.1.9.10.51.1.2.1.1 | cvpdnSessionExtEntry | CISCO-VPDN-MGMT-EXT-MIB |
| 1.3.6.1.4.1.9.10.51.1.2.1.1.10 | cvpdnSessionSentZLB | CISCO-VPDN-MGMT-EXT-MIB |