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LLdp link discovery: lldpRemLocalPortNum value 0

Description

the linkd should be able to get the lldp link from both the lldp devices.
if you check the walk of ITPN0113 you kown that everythink is file, while cheching the
ITPN0112 I found this information related to the lldp link to ITPN0112:

iso.0.8802.1.1.2.1.4.1.1.4.88.0.1 = INTEGER: 4
iso.0.8802.1.1.2.1.4.1.1.5.88.0.1 = Hex-STRING: F4 B5 2F 5E F0 80
iso.0.8802.1.1.2.1.4.1.1.6.88.0.1 = INTEGER: 7
iso.0.8802.1.1.2.1.4.1.1.7.88.0.1 = STRING: "623"
iso.0.8802.1.1.2.1.4.1.1.8.88.0.1 = STRING: "SPO_STANISLAWIE_ROUTE11"
iso.0.8802.1.1.2.1.4.1.1.9.88.0.1 = STRING: "ITPN0113"

consider that the index lldpRemTable Entry is defined:

lldpRemEntry OBJECT-TYPE
SYNTAX LldpRemEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Information about a particular physical network connection.
Entries may be created and deleted in this table by the agent,
if a physical topology discovery process is active."

INDEX {
lldpRemTimeMark,
lldpRemLocalPortNum,
lldpRemIndex
}
::= { lldpRemTable 1 }

LldpRemEntry ::= SEQUENCE {
lldpRemTimeMark TimeFilter,
lldpRemLocalPortNum LldpPortNumber,
lldpRemIndex Integer32,
lldpRemChassisIdSubtype LldpChassisIdSubtype,
......
.......

in this case we have three numbers identifying the entry.

88.0.1

The second number 0 is lldpRemLocalPortNum for this entry. But and here is the point there is no "0" as identifier for LocalPortNum.

As you can see checking the LLDP-MIB we have that the definition is..

LldpPortNumber ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"Each port contained in the chassis (that is known to the
LLDP agent) is uniquely identified by a port number.

A port number has no mandatory relationship to an
InterfaceIndex object (of the interfaces MIB, IETF RFC 2863).
If the LLDP agent is a IEEE 802.1D, IEEE 802.1Q bridge, the
LldpPortNumber will have the same value as the dot1dBasePort
object (defined in IETF RFC 1493) associated corresponding
bridge port. If the system hosting LLDP agent is not an
IEEE 802.1D or an IEEE 802.1Q bridge, the LldpPortNumber
will have the same value as the corresponding interface's
InterfaceIndex object.

Port numbers should be in the range of 1 and 4096 since a
particular port is also represented by the corresponding
port number bit in LldpPortList."

SYNTAX Integer32(1..4096)

You see that the value 0 is not allowed for this case.

So because the show lldp nei seems to have the right data I have to guess that the snmp agent put the wrong information in the lldpremotable.

In any case I can made a check for detecting this anomaly situation and create a fix.

Client Ticket

Acceptance / Success Criteria

None

Lucidchart Diagrams

Activity

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Antonio Russo March 16, 2015 at 2:56 PM

Merged features/16.0-enlinkd to develop and pushed
Total 0 (delta 0), reused 0 (delta 0)
To git@github.com:OpenNMS/opennms.git
f7c1004..4b48d40 develop -> develop

Merged features/15.0.2-enlinkd to release-15.0.2 and pushed
Counting objects: 12, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 307 bytes | 0 bytes/s, done.
Total 2 (delta 1), reused 0 (delta 0)
To git@github.com:OpenNMS/opennms.git
0afa9bf..d58df5d release-15.0.2 -> release-15.0.2

Merged features/foundation-enlinkd to foundation and pushed
Counting objects: 12, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 304 bytes | 0 bytes/s, done.
Total 2 (delta 1), reused 0 (delta 0)
To git@github.com:OpenNMS/opennms.git
34c5cac..8804f4a foundation -> foundation

Antonio Russo March 16, 2015 at 3:42 AM

Cherry picked:

Switched to branch 'features/15.0.2-enlinkd'
Your branch is up-to-date with 'origin/features/15.0.2-enlinkd'.
MacBook-Pro-di-Antonio-Russo:opennms antonio$ git cherry-pick dac3c4f4fa0f1ce67e2633c979e5076f7db181e9
[features/15.0.2-enlinkd 5e95234] Fix https://opennms.atlassian.net/browse/NMS-7183#icft=NMS-7183: enlink not able to manage lldpRemLocalPortNum value 0
13 files changed, 5172 insertionsPlus
create mode 100644 opennms-services/src/test/java/org/opennms/netmgt/enlinkd/Nms0123EnTest.java
create mode 100644 opennms-services/src/test/java/org/opennms/netmgt/nb/Nms0123NetworkBuilder.java
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0111.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0112.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0113.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0114.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0121.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0123.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0201.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0202.txt
MacBook-Pro-di-Antonio-Russo:opennms antonio$ git cherry-pick 4b48d40c8d99d3a570da1429c1e151ba7599ccd0
[features/15.0.2-enlinkd 572dbc3] Fix https://opennms.atlassian.net/browse/NMS-7183#icft=NMS-7183: enlink not able to manage lldpRemLocalPortNum value 0
5 files changed, 94 insertionsPlus, 43 deletionsMinus
MacBook-Pro-di-Antonio-Russo:opennms antonio$ git push
Counting objects: 154, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (25/25), done.
Writing objects: 100% (31/31), 3.30 KiB | 0 bytes/s, done.
Total 31 (delta 14), reused 0 (delta 0)
To git@github.com:OpenNMS/opennms.git
4930c5c..572dbc3 features/15.0.2-enlinkd -> features/15.0.2-enlinkd

MacBook-Pro-di-Antonio-Russo:opennms antonio$ git checkout features/foundation-enlinkd
Checking out files: 100% (1414/1414), done.
Switched to branch 'features/foundation-enlinkd'
Your branch is up-to-date with 'origin/features/foundation-enlinkd'.
MacBook-Pro-di-Antonio-Russo:opennms antonio$ git cherry-pick dac3c4f4fa0f1ce67e2633c979e5076f7db181e9
[features/foundation-enlinkd 00f0fe6] Fix https://opennms.atlassian.net/browse/NMS-7183#icft=NMS-7183: enlink not able to manage lldpRemLocalPortNum value 0
13 files changed, 5172 insertionsPlus
create mode 100644 opennms-services/src/test/java/org/opennms/netmgt/enlinkd/Nms0123EnTest.java
create mode 100644 opennms-services/src/test/java/org/opennms/netmgt/nb/Nms0123NetworkBuilder.java
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0111.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0112.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0113.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0114.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0121.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0123.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0201.txt
create mode 100644 opennms-services/src/test/resources/linkd/nms0123/itpn0202.txt
MacBook-Pro-di-Antonio-Russo:opennms antonio$ git cherry-pick 4b48d40c8d99d3a570da1429c1e151ba7599ccd0
[features/foundation-enlinkd 9b919fd] Fix https://opennms.atlassian.net/browse/NMS-7183#icft=NMS-7183: enlink not able to manage lldpRemLocalPortNum value 0
5 files changed, 94 insertionsPlus, 43 deletionsMinus
MacBook-Pro-di-Antonio-Russo:opennms antonio$ git push
Counting objects: 153, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (24/24), done.
Writing objects: 100% (30/30), 3.17 KiB | 0 bytes/s, done.
Total 30 (delta 13), reused 0 (delta 0)
To git@github.com:OpenNMS/opennms.git
2a039d1..9b919fd features/foundation-enlinkd -> features/foundation-enlinkd

Antonio Russo March 16, 2015 at 3:37 AM

Fixed in

Counting objects: 103, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (14/14), done.
Writing objects: 100% (16/16), 2.37 KiB | 0 bytes/s, done.
Total 16 (delta 10), reused 0 (delta 0)
To git@github.com:OpenNMS/opennms.git
dac3c4f..4b48d40 features/16.0-enlinkd -> features/16.0-enlinkd

commit 4b48d40c8d99d3a570da1429c1e151ba7599ccd0
Author: Antonio <rssntn67@yahoo.it>
Date: Mon Mar 16 08:35:24 2015 +0100

Fix https://opennms.atlassian.net/browse/NMS-7183#icft=NMS-7183: enlink not able to manage lldpRemLocalPortNum value 0

Fixed, added a control for checking the port num is valid

Antonio Russo March 15, 2015 at 3:56 PM

First commit on branch features/16.0-enlinkd:

commit dac3c4f4fa0f1ce67e2633c979e5076f7db181e9
Author: Antonio <rssntn67@yahoo.it>
Date: Sun Mar 15 20:53:03 2015 +0100

Fix https://opennms.atlassian.net/browse/NMS-7183#icft=NMS-7183: enlink not able to manage lldpRemLocalPortNum value 0

Added two test, still failing, not yer fixed

Counting objects: 160, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (30/30), done.
Writing objects: 100% (34/34), 34.17 KiB | 0 bytes/s, done.
Total 34 (delta 17), reused 0 (delta 0)
To git@github.com:OpenNMS/opennms.git
b6c00cb..dac3c4f features/16.0-enlinkd -> features/16.0-enlinkd

Antonio Russo March 12, 2015 at 6:59 AM

Linkd is deprecated, we need to check this on enhanced linkd

Fixed

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PagerDuty

Created November 15, 2014 at 12:50 PM
Updated May 11, 2015 at 3:50 PM
Resolved March 16, 2015 at 2:56 PM

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