[c-nsp] IPv6 BGP on 7200

[lee.e.rian at census.gov]

Hi Gert,

Sorry about the command syntax - my notes were wrong.  You managed to
figure it out though - it's
show cbl <module> <hex vlan number>

I guess the developers were thinking of each vlan as a separate color;
Color Blocking Logic tells the switch which vlans to block or forward on a
particular port.  The bug we were hitting on the earlier 5.5 code was the
CBL value for a port didn't match the spanning tree state for the port.  So
according to all the documented commands (sh port, sh spantree, sh
interface vlan) everything looked good - but traffic for a particular vlan
wasn't being sent on the port.

The cat6000s are nicer - they at least tell you what the CBL values are:
c6k> (enable) sh cbl 1 7b
Getting CBL Data from Module 1, Address 0x007B, Length 8
CBL States(binary): 00-disabled, 01-Blocking/Listening, 10-Learning,
11-Forwarding
  <.. snip ..>

It's a two bit value for each port.  Going back to a cat5000:

c5k> (enable) sh spant 140
   <.. snip ..>
 4/9                     140  forwarding       19       32 enabled    0
 4/11                    140  not-connected   100       32 enabled    0
 4/12                    140  not-connected   100       32 enabled    0
 4/13                    140  not-connected   100       32 disabled   0
 4/14                    140  not-connected   100       32 disabled   0
 4/15                    140  not-connected   100       32 enabled    0
 4/16                    140  not-connected    19       32 disabled   0
 4/23                    140  not-connected    19       32 enabled    0
 4/24                    140  forwarding       19       32 disabled   0
c5k> (enable) sh cbl 4 8c
        VLAN    PORT
        0x008C: 0x00000000 0x00000000 0x0000C000 0x00030000
c5k> (enable)

convert the hex to binary and start counting from the right
0x00030000 = 0000 0000 0000 0011 0000 0000 0000 0000
                               ^                   ^
                               |              port 1
                          port 9
ports 9 and 24 are forwarding traffic for vlan 140


Apparently the RSMs use the channel number instead of port number.  This
switch has an RSM in slot 2:

c5k> (enable) sh tru 2
   <.. snip ..>
Port      Vlans in spanning tree forwarding state and not pruned
--------
---------------------------------------------------------------------
 2/1      700,710
c5k> (enable) sh cbl 2 2bc 12
Getting CBL Data from Module 2, Address 0x02BC, Length 12
        VLAN    PORT              VLAN    PORT
        0x02BC: 0x0000000C        0x06BC: 0x0000000C
        0x02BD: 0x00000000        0x06BD: 0x00000000
        0x02BE: 0x00000000        0x06BE: 0x00000000
        0x02BF: 0x00000000        0x06BF: 0x00000000
        0x02C0: 0x00000000        0x06C0: 0x00000000
        0x02C1: 0x00000000        0x06C1: 0x00000000
        0x02C2: 0x00000000        0x06C2: 0x00000000
        0x02C3: 0x00000000        0x06C3: 0x00000000
        0x02C4: 0x00000000        0x06C4: 0x00000000
        0x02C5: 0x00000000        0x06C5: 0x00000000
        0x02C6: 0x00000003        0x06C6: 0x00000003
        0x02C7: 0x00000000        0x06C7: 0x00000000
c5k> (enable)
c5k> (enable) ses 2
c5k-rsm>sh control c5ip
   <.. snip ..>
Vlan    Type        DMA Channel  Method
700     ethernet    1            auto
710     ethernet    0            auto


> switch> (enable) sh cbl 9 392 2
> Getting CBL Data from Module 9, Address 0x0392, Length 2
>         VLAN    PORT              VLAN    PORT
>         0x0392: 0x0000000C        0x0792: 0x0000000C
>         0x0393: 0x00000003        0x0793: 0x00000003
>
> "so what does this tell me??"

I dunno - the problem we had was the CBL value was wrong on the line card.

Regards,
Lee



Gert Doering <gert at greenie.muc.de> wrote on 02/28/2007 01:48:29 PM:

> Hi,
>
> On Wed, Feb 28, 2007 at 07:43:08PM +0100, Gert Doering wrote:
> > On Wed, Feb 28, 2007 at 11:58:47AM -0500, lee.e.rian at census.gov wrote:
> > > > Something ancient but very proven, 5.5(13).
> > >
> > > You could be running into a bug with the color blocking logic  (show
cbl
> > > mod/port).
> >
> > What exactly is "color blocking logic"?  My Sup (Sup3/G) claims not
> > to understand that command - at least I'm not sure what port to feed to
> > it:
>
> OK, I need to feed it a module + VLAN number.  Or so.  "915" translates
> to "0x393", so this is what I get for 914 (working) and 915 (not):
>
> switch> (enable) sh cbl 9 392 2
> Getting CBL Data from Module 9, Address 0x0392, Length 2
>         VLAN    PORT              VLAN    PORT
>         0x0392: 0x0000000C        0x0792: 0x0000000C
>         0x0393: 0x00000003        0x0793: 0x00000003
>
> "so what does this tell me??"
>
> gert
> --
> USENET is *not* the non-clickable part of WWW!
>
//www.muc.de/~gert/
> Gert Doering - Munich, Germany
gert at greenie.muc.de
> fax: +49-89-35655025
gert at net.informatik.tu-muenchen.de
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