[c-nsp] Problems with dot1q trunk over EoMPLS with WS-X6148-GE-TX

[Dan Voyer]

Well, I guess this post as been beaten to death now.

I wanted to correct something i said earlier though .. a normal sup-32 can
support jumbo frame.

On Tue, Aug 10, 2010 at 10:20 AM, Heath Jones <hj1980 at gmail.com> wrote:

> Im not sure if it helps, but I remember having a lot of trouble back doing
> DSL stuff - similar issues. There was a command: 'ip tcp mss-adjust' or
> something similar - might be worth having a look at..
>
>
>
> On 8 August 2010 12:02, Marco Matarazzo <marmata at gmail.com> wrote:
>
> > Hi all,
> >
> > was trying to configure an EoMPLS link between two 6500s:
> >
> > Router1
> > 6506 w/VS-S720-10G IOS 12.2(33)SXI2
> > Customer facing blade: WS-X6148-RJ-45
> >
> > Router2
> > 6503 w/WS-SUP32-10GE-3B IOS 12.2(33)SXI2
> > Customer facing blade: WS-X6148-GE-TX
> >
> > The routers are connected between via the Sup integrated 10Gb interface,
> > mtu
> > on them is 9000.
> >
> > EoMPLS works fine if there's no dot1q trunk going over the VC. If there's
> > one set, everything SEEMS to work, pings go thru, dns requests are fine,
> I
> > can access any vlans from anywhere etc. Problems is with that I cannot
> > access any internet page of downloading anything, all the connections
> > stall!
> > Seems like a MTU problem to me so begin troubleshooting and find that the
> > maximum packet size that can travel between this dot1q trunk over EoMPLS
> is
> > 1496 instead of 1500.
> >
> > On both routers of course the VC is up:
> >
> > Router1#sh mpls l2 vc
> >
> > Local intf     Local circuit              Dest address    VC ID
>  Status
> > -------------  -------------------------- --------------- ----------
> > ----------
> > Fa2/32         Ethernet                   x.y.z.56   71172104   UP
> >
> > Router2##sh mpls l2 vc
> >
> > Local intf     Local circuit              Dest address    VC ID
>  Status
> > -------------  -------------------------- --------------- ----------
> > ----------
> > Gi2/3          Ethernet               x.y.z.40   71172104   UP
> >
> > And the MTU of the VC is 1500:
> >
> > Router1##sh mpls l2 vc 71172104 det
> > Local interface: Fa2/32 up, line protocol up, Ethernet up
> >  Destination address: x.y.z.56, VC ID: 71172104, VC status: up
> >    Output interface: Te5/5, imposed label stack {700}
> >    Preferred path: not configured
> >    Default path: active
> >    Next hop: x.y.z.14
> >  Create time: 03:32:35, last status change time: 03:32:35
> >  Signaling protocol: LDP, peer x.y.z.56:0 up
> >    Targeted Hello: x.y.z.40(LDP Id) -> x.y.z.56
> >    MPLS VC labels: local 969, remote 700
> >    Group ID: local 0, remote 0
> >    MTU: local 1500, remote 1500
> >    Remote interface description: -VC-71172104--
> >  Sequencing: receive disabled, send disabled
> >  VC statistics:
> >    packet totals: receive 1959291, send 3518574
> >    byte totals:   receive 1809500293, send 700321865
> >    packet drops:  receive 0, send 0
> >
> > Router2##sh mpls l2 vc 71172104 det
> > Local interface: Gi2/3 up, line protocol up, Ethernet up
> >  Destination address: x.y.z.40, VC ID: 71172104, VC status: up
> >    Output interface: Te1/2, imposed label stack {969}
> >    Preferred path: not configured
> >    Default path: active
> >    Next hop: x.y.z.13
> >  Create time: 3d19h, last status change time: 03:30:59
> >  Signaling protocol: LDP, peer x.y.232.40:0 up
> >    Targeted Hello: x.y.z.56(LDP Id) -> x.y.z.40
> >    MPLS VC labels: local 700, remote 969
> >    Group ID: local 0, remote 0
> >    MTU: local 1500, remote 1500
> >    Remote interface description: -VC-71172104--
> >  Sequencing: receive disabled, send disabled
> >  VC statistics:
> >    packet totals: receive 50349195, send 5715589
> >    byte totals:   receive 10440236044, send 5129079765
> >    packet drops:  receive 0, send 0
> >
> > This is the port config:
> >
> > Router1#sh run int fa 2/32
> > Building configuration...
> >
> > Current configuration : 245 bytes
> > !
> > interface FastEthernet2/32
> >  description -VC-71172104--
> >  no ip address
> >  ip verify unicast source reachable-via any allow-default
> >  no ip redirects
> >  no ip proxy-arp
> >  xconnect x.y.z.56 71172104 encapsulation mpls
> >
> > Router2##sh run int gi 2/3
> > Building configuration...
> >
> > Current configuration : 257 bytes
> > !
> > interface GigabitEthernet2/3
> >  description -VC-71172104--
> >  no ip address
> >  ip verify unicast source reachable-via any
> >  no ip redirects
> >  no ip proxy-arp
> >  speed 100
> >  duplex full
> >  xconnect x.y.z.40 71172104 encapsulation mpls
> >
> >
> > Unfortunately I cannot bump up the mtu on WS-X6148-GE-TX (need the A
> > version
> > for that!), but this is the port where the xconnect is terminating, so I
> > was
> > under the impression that I wouldn't need jumbo frames support as the
> > labels
> > would just be  passed thru the TenG mpls enabled interfaces, isn't it? I
> > verified that lowering the interface mtu of the client machines makes
> > everything work again. Played with the mpls mtu command, but it does not
> > seem to have any effect whatsoever.
> > Oddly enough, I see giants increasing on Router1, but not on Router2. I
> > assume these are the dot1q trunk packets, but then why I'm seeing the
> > counter increasing only on one side? The customer says on his switch
> > interfaces, the mtu is 1500 on both trunks.
> > So do you think I really need to bump the blade to at least
> WS-X6148A-GE-TX
> > for this config to work, or am I missing something else?
> >
> > Thanks!
> > ]\/[arco
> > --
> > I'm Winston Wolf, I solve problems.
> > _______________________________________________
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> >
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