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H3C & Cisco MACFLAPs

Occasional Contributor

H3C & Cisco MACFLAPs

Hi all,


I have a load of H3C switches (S5500 SIs) as access layer switches connecting via LACP  bundles to a stack of Cisco 3750s.


In the Cisco Logs, I'm seeing hundreds of MAC FLAPs for 000f.e207.f2e0 which appears to a a H3C mac address. Now, initially I thought we had a loop in the network somewhere, that was until I saw the mac flapping across two ports that could not possibly have a loop.


I have come across this (which I've had to run through google translate) http://tinyurl.com/8m6d8za which appears to suggest that this is expected?


Can anyone tell me how to resolve this? I've tried disabling ntdp & ndp globally on a couple of my H3Cs and I'm still seeing that mac across the uplinks.


Any help appreciated.



Trusted Contributor

Re: H3C & Cisco MACFLAPs

Hi StuPittwood 


Please post the cisco und h3c port config and the message from the cisco. May we can help you.





H3CSE, MASE Network Infrastructure [2011], Switzerland
Occasional Contributor

Re: H3C & Cisco MACFLAPs

The configs are attached.


I've removed IP, Security & some other bits.


There are 16 H3C switches hanging off this Cisco stack, all with the same problem and are all configured identically to the config attached.


Thanks in advance



Trusted Contributor

Re: H3C & Cisco MACFLAPs

Hi Stu


You don't use LACP, you use manual/static Link Aggregation.


My best experience between HP/H3C and Cisco is using LACP in active mode.



interface bridge x

  link-aggr mode dynamic



interface giga 0/x

  port-channel mode active



try this out




H3CSE, MASE Network Infrastructure [2011], Switzerland
Occasional Contributor

Re: H3C & Cisco MACFLAPs

Hi Manuel,


Thanks for the input. 


When I do that, the LACP doesn't come up.


I get this on the H3C


Aggregation Interface Type:
BAGG -- Bridge-Aggregation, RAGG -- Route-Aggregation
Aggregation Mode: S -- Static, D -- Dynamic
Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing
Actor System ID: 0x8000, 3822-d607-d72d

AGG         AGG       Partner ID               Select Unselect   Share
Interface   Mode                               Ports  Ports      Type
BAGG1       D         0x8000, 0000-0000-0000   0      2          Shar


& this on the Cisco (it's Port Channel 3)



BUKCANSW230#sh etherchannel sum
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

Number of channel-groups in use: 22
Number of aggregators:           22

Group  Port-channel  Protocol    Ports
1      Po1(SU)          -        Gi1/0/1(P)  Gi2/0/1(P)
2      Po2(SU)          -        Gi1/0/2(P)  Gi2/0/2(P)
3      Po3(SD)         LACP      Gi1/0/3(I)  Gi2/0/3(I)