Hello,
We run nav 4.4.3 and are facing a strange problem:
A Cisco 6500 (GW) ---- Linux with snmpd (GW) ---- B Cisco 6500 (SGW)
Netmap shows that Linux - B Cisco are connected but does not show the connection between A Cisco - Linux.
A Cisco IP Device Info, Neighbors does not list Linux. Linux IP Device Info, Neighbors lists neither A, nor B Cisco as neighbor. B Cisco IP Device Info, Neighbors lists Linux as neighbor.
The Direct neighborship candidates does not list the connection between A Cisco and Linux.
Linux has got IP addresses at both interfaces and added to the database with the IP address facing to B Cisco.
We added the suggested interface descriptions to both Ciscos but it did not help.
What could we do to get the connection recognized?
Best regards, Jozsef -- E-mail : kadlecsik.jozsef@wigner.mta.hu PGP key: http://www.kfki.hu/~kadlec/pgp_public_key.txt Address: Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest 114, POB. 49, Hungary
On Wed, 6 Apr 2016 20:54:51 +0200 (CEST) Kadlecsik József kadlecsik.jozsef@wigner.mta.hu wrote:
A Cisco 6500 (GW) ---- Linux with snmpd (GW) ---- B Cisco 6500 (SGW)
Netmap shows that Linux - B Cisco are connected but does not show the connection between A Cisco - Linux.
A Cisco IP Device Info, Neighbors does not list Linux. Linux IP Device Info, Neighbors lists neither A, nor B Cisco as neighbor. B Cisco IP Device Info, Neighbors lists Linux as neighbor.
The Direct neighborship candidates does not list the connection between A Cisco and Linux.
[...]
What could we do to get the connection recognized?
Hi there,
I'll try to make some educated guesses as to what is going on here:
Your Linux box doesn't support LLDP (nor CDP). Since both your "A Cisco 6500" and "Linux" are added as GW, NAV will not try to access their switch forwarding tables (not expecting them to have any). I.e there is no way for NAV to get any information about the connection between them.
Is the "A Cisco 6500" really set up as a pure L3 device, or does it have active forwarding tables? In the latter case, you should change its category to GSW. If not, you should look into enabling LLDP for the whole lot of boxes.
On Thu, 7 Apr 2016, Morten Brekkevold wrote:
On Wed, 6 Apr 2016 20:54:51 +0200 (CEST) Kadlecsik József kadlecsik.jozsef@wigner.mta.hu wrote:
A Cisco 6500 (GW) ---- Linux with snmpd (GW) ---- B Cisco 6500 (SGW)
Netmap shows that Linux - B Cisco are connected but does not show the connection between A Cisco - Linux.
A Cisco IP Device Info, Neighbors does not list Linux. Linux IP Device Info, Neighbors lists neither A, nor B Cisco as neighbor. B Cisco IP Device Info, Neighbors lists Linux as neighbor.
The Direct neighborship candidates does not list the connection between A Cisco and Linux.
[...]
What could we do to get the connection recognized?
Hi there,
I'll try to make some educated guesses as to what is going on here:
Your Linux box doesn't support LLDP (nor CDP). Since both your "A Cisco 6500" and "Linux" are added as GW, NAV will not try to access their switch forwarding tables (not expecting them to have any). I.e there is no way for NAV to get any information about the connection between them.
Is the "A Cisco 6500" really set up as a pure L3 device, or does it have active forwarding tables? In the latter case, you should change its category to GSW. If not, you should look into enabling LLDP for the whole lot of boxes.
"A Cisco 6500" is indeed a pure L3 device. I have installed and configured lldpd on the Linux router and now the topology is shown properly.
Thank you!
Best regards, Jozsef -- E-mail : kadlecsik.jozsef@wigner.mta.hu PGP key: http://www.kfki.hu/~kadlec/pgp_public_key.txt Address: Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest 114, POB. 49, Hungary
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Kadlecsik József -
Morten Brekkevold