Peering import from SNMP

[paravoid]

Environment

• Peering Manager version: master

Proposed Functionality & Use Case

As an alternative to the NAPALM & Netbox/NAPALM peering import, it could perhaps be interesting to also support importing from SNMP as a more lightweight approach. An example code using the excellent snimpy library would be:

from snimpy.manager import Manager as M
from snimpy.manager import load
from snimpy.snmp import SNMPException

load("BGP4-MIB")

for router, community in …:
    m = M(host=router, community=community, version=2)

    try:
        peers = m.bgpPeerRemoteAs
        for ip, asn in peers.iteritems():
            …
    except SNMPException as e:
        …

Important caveat: this is IPv4-only. The IPv6 BGP MIB never got out of draft status and there are vendor-specific implementations for it. I tried to make this work with BGP4-V2-MIB-JUNIPER + our Juniper gear ~3 years ago and ran into a wall: I asked the snimpy author at the time, who didn't see anything wrong with his code, asked j-nsp, and got confirmation from Juniper that this was a bug on their implementation(!) and filed a PR internally. This was fixed in recent JunOS (18.1+), but requires extra config on the Juniper router (set protocols bgp snmp-options emit-inet-address-length-in-oid command). I never got to implement that codepath, though, or other vendors (like Cisco and Arista's). That needs some playing around from folks that own such equipment.

External Dependencies

• snimpy

[borisski]

[snmp_poll_peering_sessions.py.txt](https://github.com/peering-manager/peering-manager/files/7234291/snmp_poll_peering_sessions.py.txt

)
Hello, I wrote a small snippet that grab info from snmp for CISCO router, you just need to put it in peering/management/commands/ and configure the snmp (only v2 supported at this time) in the router config context (as in the print screen). Script is based on easysnmp python library (much more faster as it is a binding of the net-snmp in C) and also require a further install on debian:
sudo apt-get install libsnmp-dev
sudo apt-get install snmp-mibs-downloader # optional
sudo apt-get install gcc python-dev
pip install easysnmp