[f-nsp] arp problem on brocade mlx

[Eldon Koyle]

You might check the number of MAC addresses it sees (sh mac)... if
there is a device going insane somewhere, it could exhaust the mac
forwarding DB and cause strange behavior.

sh default values | inc mac
SSH at mlx4#sh default values | inc mac
sys log buffers:50         mac age time:300 sec       telnet sessions:5
mac                      32768      1048576    32768      32768
32768      Yes
vpls-mac                 2048       262144     2048       2048
2048       Yes
SSH at mlx4#

Do you have spanning tree running on this interface?

I'm assuming these interfaces are in the default VRF, but if not it
opens up a whole world of other possibilities.

You could also check the TM log, although you would have to open a
ticket to find out what any of it meant:
sh tm log


On Wed, Dec 16, 2015 at 10:44 AM, Tudor Capatina via foundry-nsp
<foundry-nsp at puck.nether.net> wrote:
> Hello all,
>
> on a brocade mlx-4 running IronWare : Version 5.4.0fT163, following a crash (was doing a no ip route under a ip vrf and the box rebooted itself), I am facing a weird problem.
>
> On a 10G interface i have several customers, each connected in a vlan, with a vlan interface and a /30 used for the connection. All were working ok before the crash. Now on some of them i get the following behaviour: i receive a mac-address all the time, at times there is an arp entry, after some time it is gone, later it works again (sometime after a cpe reboot, sometime it just works).
>
> It sounded to me like a cache or an arp limit problem but:
>
> sh ip cache
> Total IP and IPVPN Cache Entry Usage on LPs:
>  Module        Host    Network       Free      Total
>       1        3745     361450     159093     524288
>       2        4132     361450     158706     524288
>       3        4996     361450     157842     524288
>       4        4884     361450     157954     524288
>
>
> respectively:
> #sh default values | i arp
> ip arp age:10 min          bootp relay max hops:4     ip ttl:64 hops
> ip-arp                   8192       65536      8192       8192       8192       No
>
> while my arp usage is of 2k (as seen by show arp)
>
> Any ideas what i could look at or what might cause this? Logs do not mention anything relevant.
>
> Thanks a lot,
> Tudor
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