Re: cam timer tuning

This all looks fine, but what about your native vlan. is vlan 1 your
native vlan all the way around the triangle? Can you provide the output
for:

show spanning-tree mst configuration
show interface trunk

Thanks,
JS

On Fri, Dec 28, 2012 at 11:01 AM, Naufal Jamal <naufalccie_at_yahoo.in> wrote:

> Thanks for responding Joe. here is a brief summary of topology
>
> Pair of nexus 7k (csw01/csw02) in core, set of access switches (asw's)
> connected to both of them.eg asw324 t1/49 connected to csw01 and t1/50
> connected to csw02. no port-channelling. csw01 is HSRP primary and STP root
> for all the vlans. MSTP running in the environment. looking at asw, t1/49
> is root port and t1/50 is blocking port. below is the config on asw's.
> whenever we add any new asw, we see the flooding for more than 10 minutes
> until arp is cleared.
>
> interface TenGigabitEthernet1/49
> description eat1-22164-csw01-eth2-9.corp
> switchport trunk allowed vlan 790
> switchport mode trunk
> switchport nonegotiate
> mtu 9198
> logging event link-status
> logging event trunk-status
> udld port aggressive
> spanning-tree portfast disable
> spanning-tree bpduguard disable
> spanning-tree link-type point-to-point
> end
>
> interface TenGigabitEthernet1/50
> description eat1-22164-csw02-eth2-9.corp
> switchport trunk allowed vlan 790
> switchport mode trunk
> switchport nonegotiate
> mtu 9198
> logging event link-status
> logging event trunk-status
> udld port aggressive
> spanning-tree portfast disable
> spanning-tree bpduguard disable
> spanning-tree link-type point-to-point
> end
>
> eat1-22164-asw324.corp#sh spanning-tree vlan 790
>
> MST1
> Spanning tree enabled protocol mstp
> Root ID Priority 8193
> Address 4055.3909.5a41
> Cost 2000
> Port 49 (TenGigabitEthernet1/49)
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>
> Bridge ID Priority 61441 (priority 61440 sys-id-ext 1)
> Address 2c54.2dbd.13c0
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>
> Interface Role Sts Cost Prio.Nbr Type
> ------------------- ---- --- --------- --------
> --------------------------------
> Te1/49 Root FWD 2000 128.49 P2p
> Te1/50 Altn BLK 2000 128.50 P2p
>
> CSW config
>
> interface Ethernet2/9
> description eat1-22164-asw324-te1-50.corp
> switchport
> switchport mode trunk
> switchport trunk allowed vlan 790
> spanning-tree link-type point-to-point
> spanning-tree guard root
> mtu 9216
> logging event port link-status
> logging event port trunk-status
> udld aggressive
> no shutdown
>
>
>
>
> ------------------------------
> *From:* Joe Sanchez <marco207p_at_gmail.com>
> *To:* Naufal Jamal <naufalccie_at_yahoo.in>
> *Cc:* Carlos G Mendioroz <tron_at_huapi.ba.ar>; "ccielab_at_groupstudy.com" <
> ccielab_at_groupstudy.com>
> *Sent:* Friday, 28 December 2012 10:21 PM
>
> *Subject:* Re: cam timer tuning
>
> Naufal,
>
> you say your using Nexus without vPC... connected to 4948's , can you give
> us more information as to how you have the nexus and 4948's connected and
> what configuration they on them. Trying to solve for a an issue with this
> little of information is difficult.
>
> JS.
>
> On Fri, Dec 28, 2012 at 10:42 AM, Naufal Jamal <naufalccie_at_yahoo.in>wrote:
>
> Carlos- unicast flooding due to TCN is understood by design but does it
> really
> go on for 10 minutes?? our network graphs shows spikes for nearly 10
> minutes
> until we do a clear ip arp. This really should not be happening in a stable
> STP environment.. Anyways i am trying the below URL
>
> http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186
> a00807347ab.shtml#broadcast<http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00807347ab.shtml#broadcast>
>
>
>
>
> ________________________________
> From: Carlos
> G Mendioroz <tron_at_huapi.ba.ar>
> To: Naufal Jamal <naufalccie_at_yahoo.in>
> Cc:
> "ccielab_at_groupstudy.com" <ccielab_at_groupstudy.com>
> Sent: Friday, 28 December
> 2012 3:41 PM
> Subject: Re: cam timer tuning
>
> What makes you believe that the
> difference has anything to do with it ?
> Specially after (correctly) infering
> that TC is causing the flooding!
>
> TC means a MAC could be now anywhere else
> (from a switch standpoint) so
> I guess the solution to your problem (flooding)
> is to get rid of STP :)
>
> -Carlos
>
> Naufal Jamal @ 28/12/2012 06:40 -0300 dixit:
> > Hello,
> >
> > We have a pair of nexus 7K's (without vpc) running HSRP and MSTP.
> > They are connected to access layer switches 4948's. whenever we bring up
> a
> new
> > trunk link between Nexus 7K and 4948 we see unicast flooding caused due
> to
> > TCN's. I am wondering if it has something to do with the difference in
> cam
> > aging timer in both the platforms. Nexus (1800 secs) and 4948 (300
> secs). can
> > anyone put some light here please? I am thinking that changing
> the aging timer
> > on nexus to 300 secs should help.. any thoughts?
> >
> > Naufal
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
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> >
> >
> >
>
> --
> Carlos G
> Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
> Blogs and organic groups
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> _______________________________________________________________________
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>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Fri Dec 28 2012 - 11:14:04 ART