[action] [PR:13070] Modify snmp link local test to use config cli

[mssonicbld]

Description of PR

Summary:
Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 201911
• 202012
• 202205
• 202305
• 202311

Approach

What is the motivation for this PR?

How did you do it?

Modify snmp_link_local_test to test after configuring link local snmp agent address using config snmpagentaddress cli.
Pre requisite: sonic-net/sonic-utilities#3215

How did you verify/test it?

Manual test:
admin@host:~$ sonic-db-cli CONFIG_DB keys "*SNMP*"
ACL_TABLE|SNMP_ACL
SNMP_AGENT_ADDRESS_CONFIG|10.1.1.1|161|
SNMP_AGENT_ADDRESS_CONFIG|fc00:2::32|161|
SNMP|LOCATION
SNMP_AGENT_ADDRESS_CONFIG|10.1.0.32|161|
SNMP_AGENT_ADDRESS_CONFIG|FC00:1::32|161|
SNMP_COMMUNITY|public

sudo config snmpagentaddress add fe80:1::32%eth0

admin@host:~$ sonic-db-cli CONFIG_DB keys "*SNMP*"
ACL_TABLE|SNMP_ACL
SNMP_AGENT_ADDRESS_CONFIG|10.1.1.1|161|
SNMP_AGENT_ADDRESS_CONFIG|fc00:2::32|161|
SNMP|LOCATION
SNMP_AGENT_ADDRESS_CONFIG|10.1.0.32|161|
SNMP_AGENT_ADDRESS_CONFIG|fe80:1::32%eth0||
SNMP_AGENT_ADDRESS_CONFIG|FC00:1::32|161|
SNMP_COMMUNITY|foo


admin@host:~$ docker exec -it snmp cat /etc/snmp/snmpd.conf | grep agentAddress
agentAddress udp:[10.1.0.32]:161
agentAddress udp:[10.1.1.1]:161
agentAddress udp6:[fc00:2::32]:161
agentAddress udp6:[FC00:1::32]:161
agentAddress udp:[fe80:1::32%eth0]

admin@host:~$ sudo netstat -tulnp | grep 161
udp 0 0 10.1.1.1:161 0.0.0.0:* 432467/snmpd 
udp 0 0 10.1.0.32:161 0.0.0.0:* 432467/snmpd 
udp6 0 0 fe80:1::32:161 :::* 432467/snmpd 
udp6 0 0 fc00:1::32:161 :::* 432467/snmpd 
udp6 0 0 fc00:2::32:161 :::* 432467/snmpd 

root@host:/# snmpget -v2c -c public fe80:1::32%eth0 1.3.6.1.2.1.1.1.0
iso.3.6.1.2.1.1.1.0 = STRING: "SONiC Software Version: SONiC.20231110.10 - HwSku: Arista-7260CX3-C64 - Distribution: Debian 11.9 - Kernel: 5.10.0-23-2-amd64"

admin@host:~$ sudo config snmpagentaddress del fe80:1::32%eth0

root@host:/# snmpget -v2c -c public fe80:1::32%eth0 1.3.6.1.2.1.1.1.0
Timeout: No Response from fe80:1::32%eth0.

Run sonic-mgmt test:
snmp/test_snmp_link_local.py::test_snmp_link_local_ip[host] PASSED [100%]

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[mssonicbld]

Original PR: #13070