On Jul 11, 2011, at 3:44 PM, Ben Pfaff wrote:
> + if (dst[0] == 0x01 && dst[1] == 0x00 && dst[2] == 0x0c) {
> + /* Cisco OUI. */
> + if ((dst[3] & 0xfe) == 0xcc &&
> + (dst[4] & 0xfe) == 0xcc &&
> + (dst[5] & 0xfe) == 0xcc) {
> + /* Drop the following protocols plus others following the
> same
> + pattern:
> +
> + CDP, VTP, DTP, PAgP (01-00-0c-cc-cc-cc)
> + Spanning Tree PVSTP+ (01-00-0c-cc-cc-cd)
> + STP Uplink Fast (01-00-0c-cd-cd-cd) */
> + return false;
> + }
Do we know that the other cc/cd combinations are safe to not forward? I'm
guessing yes, but we may want to confirm with a Cisco expat.
> + <dt><code>01:00:c2:00:00:00</code></dt>
> + <dd>IEEE 802.1D Spanning Tree Protocol (STP).</dd>
> +
> + <dt><code>01:00:c2:00:00:01</code></dt>
> + <dd>IEEE Pause frame.</dd>
> +
> + <dt><code>01:00:c2:00:00:0<var>x</var></code></dt>
> + <dd>Other reserved protocols.</dd>
I believe the second octet on these previous three addresses is supposed to be
80.
--Justin
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