Re: [ovirt-users] 答复: bond mode balance-alb

29 Dec 2014

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On 12/29/2014 12=3A56 AM=2C Dan Kenigsberg wrote=3A
=3E On Fri=2C Dec 26=2C 2014 at 12=3A39=3A45PM -0600=2C Blaster wrote=3A
=3E=3E On 12/23/2014 2=3A55 AM=2C Dan Kenigsberg wrote=3A
=3E=3E=3E Bug 1094842 - Bonding modes 0=2C 5 and 6 should be avoided for VM=
 networks
=3E=3E=3E https=3A//bugzilla=2Eredhat=2Ecom/show=5Fbug=2Ecgi=3Fid=3D1094842=
=23c0
=3E=3E Dan=2C
=3E=3E
=3E=3E What is bad about these modes that oVirt can=27t use them=3F
=3E I can only quote jpirko=27s workds from the link above=3A
=3E
=3E     Do not use tlb or alb in bridge=2C never! It does not work=2C that=
=27s it=2E The reason
=3E     is it mangles source macs in xmit frames and arps=2E When it is pos=
sible=2C just
=3E     use mode 4 =28lacp=29=2E That should be always possible because all=
 enterprise
=3E     switches support that=2E Generally=2C for 99=25 of use cases=2C you=
 *should* use mode
=3E     4=2E There is no reason to use other modes=2E
=3E
This switch is more of an office switch and only supports part of the
802=2E3ad standard=3A

            PowerConnect* *2824

    Scalable from small workgroups to dense access solutions=2C the 2824
    offers 24-port flexibility plus two combo small=E2=80=91form=E2=80=91fa=
ctor
    pluggable =28SFP=29 ports for connecting the switch to other networking=

    equipment located beyond the 100 m distance limitations of copper
    cabling=2E

    Industry-standard link aggregation adhering to IEEE 802=2E3ad
    standards =28static support only=2C LACP not supported=29

So the only way to have some kind of bonding without buying more
expensive switches=2C is using balance-rr =28mode=3D0=29=2C balance-xor=20=
=28mode=3D2=29
or broadcast =28modes=3D3=29=2E
=3E=3E I just tested mode 4=2C and the LACP with Fedora 20 appears to not b=
e
=3E=3E compatible with the LAG mode on my Dell 2824=2E
=3E=3E
=3E=3E Would there be any issues with bringing two NICS into the VM and doi=
ng
=3E=3E balance-alb at the guest level=3F
=3E=3E
Kind regards=2C

Jorick Astrego

Met vriendelijke groet=2C With kind regards=2C

Jorick Astrego

Netbulae Virtualization Experts=20

----------------

=09Tel=3A 053 20 30 270 =09info=40netbulae=2Eeu =09Staalsteden 4-3A =09KvK=
 08198180
 =09Fax=3A 053 20 30 271 =09www=2Enetbulae=2Eeu =097547 TA Enschede =09BTW=
 NL821234584B01

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    =3Cdiv class=3D=22moz-cite-prefix=22=3EOn 12/29/2014 12=3A56 AM=2C Dan=
 Kenigsberg
      wrote=3A=3Cbr=3E
    =3C/div=3E
    =3Cblockquote cite=3D=22mid=3A20141228235658=2EGE21690=40redhat=2Ecom=
=22 type=3D=22cite=22=3E
      =3Cpre wrap=3D=22=22=3EOn Fri=2C Dec 26=2C 2014 at 12=3A39=3A45PM -06=
00=2C Blaster wrote=3A
=3C/pre=3E
      =3Cblockquote type=3D=22cite=22=3E
        =3Cpre wrap=3D=22=22=3EOn 12/23/2014 2=3A55 AM=2C Dan Kenigsberg wr=
ote=3A
=3C/pre=3E
        =3Cblockquote type=3D=22cite=22=3E
          =3Cpre wrap=3D=22=22=3EBug 1094842 - Bonding modes 0=2C 5 and 6 s=
hould be avoided for VM networks
=3Ca class=3D=22moz-txt-link-freetext=22 href=3D=22https=3A//bugzilla=2Ered=
hat=2Ecom/show=5Fbug=2Ecgi=3Fid=3D1094842=23c0=22=3Ehttps=3A//bugzilla=2Ere=
dhat=2Ecom/show=5Fbug=2Ecgi=3Fid=3D1094842=23c0=3C/a=3E
=3C/pre=3E
        =3C/blockquote=3E
        =3Cpre wrap=3D=22=22=3E
Dan=2C

What is bad about these modes that oVirt can=27t use them=3F
=3C/pre=3E
      =3C/blockquote=3E
      =3Cpre wrap=3D=22=22=3E
I can only quote jpirko=27s workds from the link above=3A

    Do not use tlb or alb in bridge=2C never! It does not work=2C that=27s=
 it=2E The reason
    is it mangles source macs in xmit frames and arps=2E When it is possibl=
e=2C just
    use mode 4 =28lacp=29=2E That should be always possible because all ent=
erprise
    switches support that=2E Generally=2C for 99=25 of use cases=2C you *sh=
ould* use mode
    4=2E There is no reason to use other modes=2E

=3C/pre=3E
    =3C/blockquote=3E
    This switch is more of an office switch and only supports part of
    the 802=2E3ad standard=3A=3Cbr=3E
    =3Cblockquote=3E
      =3Cbr=3E
      =3Ch4 style=3D=22margin=3A 0px=3B padding=3A 0px 0px 5px=3B border=3A=
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        normal=3B widows=3A auto=3B word-spacing=3A 0px=3B
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        float=3A none=3B background-color=3A rgb=28238=2C 238=2C 238=29=3B=
=22=3EScalable
        from small workgroups to dense=C2=A0access solutions=2C the 2824 of=
fers
        24-port flexibility plus two=C2=A0combo small=E2=80=91form=E2=80=91=
factor pluggable
        =28SFP=29 ports for connecting the switch to other networking
        equipment located beyond the 100 m distance limitations of
        copper cabling=2E=3C/span=3E=3Cbr=3E
      =3Cbr=3E
      =3Cspan style=3D=22color=3A rgb=280=2C 0=2C 0=29=3B font-family=3A Ar=
ial=2C Helvetica=2C
        sans-serif=3B font-size=3A 11px=3B font-style=3A normal=3B font-var=
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        normal=3B widows=3A auto=3B word-spacing=3A 0px=3B
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        float=3A none=3B background-color=3A rgb=28242=2C 242=2C 242=29=3B=
=22=3EIndustry-standard
        link aggregation adhering to IEEE 802=2E3ad standards =28static
        support only=2C LACP not supported=29=3C/span=3E=3C/blockquote=3E=

    =3Cbr=3E
    So the only way to have some kind of bonding without buying more
    expensive switches=2C is using balance-rr =28mode=3D0=29=2C balance-xor=

    =28mode=3D2=29 or broadcast =28modes=3D3=29=2E=3Cbr=3E
    =3Cblockquote cite=3D=22mid=3A20141228235658=2EGE21690=40redhat=2Ecom=
=22 type=3D=22cite=22=3E
      =3Cblockquote type=3D=22cite=22=3E
        =3Cpre wrap=3D=22=22=3E
I just tested mode 4=2C and the LACP with Fedora 20 appears to not be
compatible with the LAG mode on my Dell 2824=2E

Would there be any issues with bringing two NICS into the VM and doing
balance-alb at the guest level=3F

=3C/pre=3E
      =3C/blockquote=3E
    =3C/blockquote=3E
    Kind regards=2C=3Cbr=3E
    =3Cbr=3E
    Jorick Astrego=3Cbr=3E
 =20=
=3CBR /=3E
=3CBR /=3E
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