[f-nsp] CAM IPv6 partition warning even if cam partition not full

Andreas Schlee andreas.schlee at godaddy.com
Tue Oct 2 05:06:24 EDT 2018


>show def val | in ipv6
ipv6-cache                     131072     1884160    131072     131072     131072     Yes
ipv6-route                     131072     1884160    131072     131072     131072     Yes
ipv6-mcast-cam                 2048       16384      2048       2048       2048       No
ipv6-vrf-route                 1024       98304      1024       1024       1024       Yes
ipv6-receive-cam               8          8192       8          8          8          No
np-openflow-flow-entries : layer3ipv6                1          0          65536      0          No
np-openflow-flow-entries : layer3ipv6                2          0          65536      0          No
np-openflow-flow-entries : layer3ipv6                3          0          65536      0          No
np-openflow-flow-entries : layer3ipv6                4          0          65536      0          No
np-openflow-flow-entries : layer3ipv6                5          0          65536      0          No
np-openflow-flow-entries : layer3ipv6                6          0          65536      0          No
np-openflow-flow-entries : layer3ipv6                7          0          65536      0          No
np-openflow-flow-entries : layer3ipv6                8          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               1          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               2          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               3          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               4          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               5          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               6          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               7          0          65536      0          No
np-openflow-flow-entries : layer23ipv6               8          0          65536      0          No

________________________________________
Von: foundry-nsp <foundry-nsp-bounces at puck.nether.net> im Auftrag von Eldon Koyle <ekoyle+puck.nether.net at gmail.com>
Gesendet: Dienstag, 2. Oktober 2018 07:28:00
An: foundry-nsp
Betreff: Re: [f-nsp] CAM IPv6 partition warning even if cam partition not full

Can you check the output of:
  show default values | inc ipv6

--
Eldon


On Sun, Sep 30, 2018, 08:32 Dennis op de Weegh <info at bitency.nl<mailto:info at bitency.nl>> wrote:
Hi Andreas,

We have for IPv6 system-max:

system-max ipv6-cache 60000
system-max ipv6-route 60000



Kind regards/Met vriendelijke groet,

Dennis op de Weegh



Bitency
Hoge Ham 24
5104JG Dongen

Kvk nummer: 20144338
BTW nummer: NL213538519B01

W: www.bitency.nl<http://www.bitency.nl>
E: info at bitency.nl<mailto:info at bitency.nl>
T: +31 (0)162 714066


-----Oorspronkelijk bericht-----
Van: Andreas Schlee <andreas.schlee at godaddy.com<mailto:andreas.schlee at godaddy.com>>
Verzonden: zondag 30 september 2018 16:23
Aan: Dennis op de Weegh <info at bitency.nl<mailto:info at bitency.nl>>; foundry-nsp at puck.nether.net<mailto:foundry-nsp at puck.nether.net>
Onderwerp: AW: CAM IPv6 partition warning even if cam partition not full

Hello Dennis,

CAM partitioning profile is ipv4-ipv6-2, all modules are BR-MLX-10Gx4-X We only get those messages from module 3, not from the other one.

>show run | in system-max
system-max vlan 2000
system-max spanning-tree 1
system-max ip-cache 1048576
system-max ip-route 1048576
system-max virtual-interface 1024

What else do you need from the config?

Best regards,
Andreas Schlee

________________________________________
Von: Dennis op de Weegh <info at bitency.nl<mailto:info at bitency.nl>>
Gesendet: Sonntag, 30. September 2018 14:59:36
An: Andreas Schlee; foundry-nsp at puck.nether.net<mailto:foundry-nsp at puck.nether.net>
Betreff: RE: CAM IPv6 partition warning even if cam partition not full

Hi Andreas,

Which cam profile do you use?
Can you post your config?

Maybe the same bug in 2016:
https://puck.nether.net/pipermail/foundry-nsp/2016-March/009467.html


Kind regards/Met vriendelijke groet,

Dennis op de Weegh



Bitency
Hoge Ham 24
5104JG Dongen

Kvk nummer: 20144338
BTW nummer: NL213538519B01

W: www.bitency.nl<http://www.bitency.nl>
E: info at bitency.nl<mailto:info at bitency.nl>
T: +31 (0)162 714066


-----Oorspronkelijk bericht-----
Van: foundry-nsp <foundry-nsp-bounces at puck.nether.net<mailto:foundry-nsp-bounces at puck.nether.net>> Namens Andreas Schlee
Verzonden: zondag 30 september 2018 10:19
Aan: foundry-nsp at puck.nether.net<mailto:foundry-nsp at puck.nether.net>
Onderwerp: [f-nsp] CAM IPv6 partition warning even if cam partition not full

Hi, on our MLXe running IronWare 6.0.0f we're getting CAM IPv6 partition warnings:

>sh log | in CAM
Sep 26 11:43:25:A:CAM IPv6 partition warning: total 65536 (reserved 0), free 51, slot 3, ppcr 1 Sep 26 11:38:25:A:CAM IPv6 partition warning: total 65536 (reserved 0), free 44, slot 3, ppcr 1 Sep 26 11:33:25:A:CAM IPv6 partition warning: total 65536 (reserved 0), free 22, slot 3, ppcr 1 Sep 26 11:28:25:A:CAM IPv6 partition warning: total 65536 (reserved 0), free 62, slot 3, ppcr 1 Sep 26 11:23:25:A:CAM IPv6 partition warning: total 65536 (reserved 0), free 100, slot 3, ppcr 1 Sep 26 11:18:25:A:CAM IPv6 partition warning: total 65536 (reserved 0), free 43, slot 3, ppcr 1

But the cam partition usage tells us there is still space free:

>show cam-partition usage  slot 3
Slot 3 XPP20SP 0:
[...]
          [IPV6]  65536(size),   10218(free), 084.40%(used)
        :SNet 0:  10470(size),   10207(free), 002.51%(used)
        :SNet 1:  51359(size),       5(free), 099.99%(used)
        :SNet 2:   3268(size),       0(free), 100.00%(used)
        :SNet 3:    377(size),       0(free), 100.00%(used)
        :SNet 4:     45(size),       0(free), 100.00%(used)
        :SNet 5:      9(size),       0(free), 100.00%(used)
        :SNet 6:      2(size),       1(free), 050.00%(used)
        :SNet 7:      2(size),       2(free), 000.00%(used)
        :SNet 8:      2(size),       2(free), 000.00%(used)
        :SNet 9:      2(size),       1(free), 050.00%(used)

>show ipv6 route sum
IPv6 Routing Table - 55032 entries:
  122 connected, 0 static, 0 RIP, 0 OSPF, 54910 BGP, 0 ISIS
  Number of prefixes:
  /16:1 /19:2 /20:11 /21:3 /22:6 /23:4 /24:21 /25:6 /26:15 /27:17
  /28:82 /29:2292 /30:210 /31:123 /32:10733 /33:697 /34:595 /35:419
  /36:2143 /37:403 /38:473 /39:166 /40:2878 /41:379 /42:579 /43:135
  /44:4056 /45:343 /46:1455 /47:521 /48:25424 /50:4 /54:9 /56:39
  /64:243 /112:1 /123:1 /124:5 /125:7 /126:489 /127:9 /128:33 Nexthop Table Entry - 120 entries


So the warning tells us a highly different amount of free entries compared to the log: 10218 <-> 51 We checked the usage about 2 minutes after the warning appeared in the log.

Anyone out there facing or faced the same issue? What information should we trust now: the warning in the log or the cam-partition usage?
Another question would be: what are the "SNet" entries we see in the cam-partition, and why are some of them this small (size of 2)?

Finally, the manual says about partition sharing:
Supernet TCAM partition sharing
In Brocade NetIron software versions prior to 03.2.00, TCAM resources could not be shared between the 32 levels of the IP Forwarding Information Base (FIB). Beginning with 03.2.00, TCAM allocation is optimized for dynamic allocation of resources to each level. If one level runs out of TCAM resources, it can obtain resources that have been allocated to another level but are unused. This feature applies to IPv4 and Layer 3 VPN routes.

Does that mean that there is no sharing between the supernets in IPV6 CAM?

Regards,
Andreas Schlee

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