[j-nsp] EX4550 (Un-)known unicast flooding at session start for up to 100ms

[Tim]

Hi Pavel,

not sure if it's related but is very interessting. I checked the mac
learning log on several 4550 and found the learn/delete indicator
minute by minute. I think we will increase the entry counts per index
an look if something getting better (or worse).

Regards,
Tim

2017-08-12 11:54 GMT+02:00 Pavel Lunin <plunin at gmail.com>:
>
>
> Not sure this is specifically related to the OP but there is a known
> hardware limitation/feature of some Broadcom chips used in many EX switches
> of the previous generations (including EX4500). They use a hash table to
> reduce MAC lookup length, which was too small in some older JUNOS versions,
> leading to hash-collisions and consequent mac learning failures in some
> scenarios.
>
> Links, worth to check:
>
> https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/mac-lookup-length-edit-ethernet-switching-options.html
> https://forums.juniper.net/t5/Ethernet-Switching/EX4500-show-ethernet-switching-hash-collisions/td-p/204849
> https://yingsnotebook.wordpress.com/2017/03/20/mac-address-learning-problem-in-juniper-ex-switch/
>
>
>
>
> 2017-08-12 2:14 GMT+02:00 Aaron Gould <aaron1 at gvtc.com>:
>>
>> Sorry to hear that.
>>
>> I may have mentioned previously to someone else on the list... my EX4550's
>> are rock solid... over 4 years uptime... I run our mirrored/redundant data
>> centers behind them (hp 3par, hypervisors, etc) and our internet cdn caches
>> behind them too...(Akamai, netflix, and that other one)
>>
>> A pair of 4550's in top of racks virtual chassis'ed together
>>
>> Here they are...
>>
>> root at sabn-dcvc-4550> show system uptime | grep "up|fpc"
>> fpc0:
>> 7:07PM  up 1516 days,  5:51, 0 users, load averages: 0.09, 0.11, 0.08
>> fpc1:
>> 7:07PM  up 1516 days,  5:51, 2 users, load averages: 0.22, 0.17, 0.16
>>
>>
>> root at stlr-dcvc-4550> show system uptime | grep "up|fpc"
>> fpc0:
>> 7:09PM  up 1520 days,  4:21, 0 users, load averages: 0.11, 0.15, 0.14
>> fpc1:
>> 7:09PM  up 1520 days,  4:42, 1 user, load averages: 0.25, 0.22, 0.18
>>
>>
>> root at stlr-dcvc-4550> show version | grep "fpc|model|boot"
>> fpc0:
>> --------------------------------------------------------------------------
>> Model: ex4550-32f
>> JUNOS Base OS boot [12.2R4.5]
>> fpc1:
>> --------------------------------------------------------------------------
>> Model: ex4550-32f
>> JUNOS Base OS boot [12.2R4.5]
>>
>> ....run a bunch of vlans/stp...
>>
>> {master:1}
>> root at stlr-dcvc-4550> show spanning-tree bridge brief | grep
>> "protocol|Vlan"
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 12
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 1000
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 10
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 11
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 210
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 204
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 202
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 201
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 14
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 13
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 1006
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 101
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 921
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 2
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 2202
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 3
>> Enabled protocol                    : RSTP
>>
>> STP bridge parameters for VLAN 4
>>
>>
>>
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>
>