From: mahmoud genidy (ccie.mahmoud@gmail.com)
Date: Fri Feb 27 2009 - 09:37:57 ARST
Hi GS,
Any body know how you can statically deny or forward specific MAC addresses
through a bridge? Also how to disable the dynamic learning of the MAC
addresses on the bridge?
I used what the DOC CD says and it is not working with me. To disable
dynamic mac learning we have to use NO BRIDGE 1 ACQUIRE command. I used it
and I still can see the dynamic MAC on the bridge group I have configured.
Also I used Bridge forward and discard commands but also doesn't work. Here
is my config:
{
bridge 1 protocol vlan-bridge
no bridge 1 acquire
bridge 1 address 1234.1234.1234 forward
bridge 1 address 9876.9876.9876 discard
interface Vlan13
ip address 51.51.10.7 255.255.255.0
bridge-group 1
!
interface FastEthernet0/12
no switchport
no ip address
bridge-group 1
!
}
Any hidden fact or concept here?
Thanks
M Genidy
On Fri, Feb 27, 2009 at 3:50 PM, Nitro Drops <nitrodrops@hotmail.com> wrote:
> Hi All,
>
> Like to hijack this thread. Was practising Fallback Bridging yesterday,
> encountered this issue.
>
> IPv4 : R6 G0/1 (106.0.0.6) >> (106.0.0.10) F1/6 SW4 F1/4 (vlan104
> 104.0.0.10)
> >> (104.0.0.4)F0/1 R4
> IPv6 : R6 G0/1 (2001::6/64) >> F1/6 SW4 F1/4 >> (2001::4/64)F0/1 R4
>
> IPv6 is setup to test on the fallback bridging
> After i enabled Fallback Bridging on the 'int vlan104' & 'f0/6' of SW4. My
> results are as follows
>
>
>
> 1.) R4 F0/1 (ipv6 - 2001::4/64) is able to ping/trace R6 F0/1 (ipv6 -
> 2001::6/64)
> 2.) R4 F0/1 (ipv4 - 106.0.0.6) is NOT able to ping/trace R6 F0/1 (ipv4 -
> 104.0.0.4). if i remove bridging on SW4, R4 F0/1 (ipv4) is ABLE to
> ping/trace
> R6 F0/1 (ipv4)
>
>
>
> I am using Dynamips running - (C3725-ADVENTERPRISEK9-M)
>
> For my troubleshooting, i did
>
> - sh ip routes on R4 and R6, i can see the RIP routes on both routers
>
> - did 'debug ip packet' & 'debug ip routing', when i tried to ping from R4
> to
> R6, i dont see any packets hitting SW4.
>
> My understanding of Fallback bridging, it bridges non-routed protocol
> between SVIs and L3 routed interfaces. So i assum routed protocol will
> remain as routable?
>
> Any kind advises?
>
>
>
> Cheers
>
> Nit
>
>
>
>
> > Date: Fri, 20 Feb 2009 05:03:01 +0000
> > From: joe_astorino@comcast.net
> > To: joe_astorino@comcast.net
> > CC: ccielab@groupstudy.com; raghavbhargava12@gmail.com
> > Subject: Re: Fallback Bridging
> >
> > Let me rephrase what I said in my most recent post. Suppose ports 1-5 AND
> ports 6-10 are running the SAME non-IP protocol and they want to talk but
> are
> in different VLANs. The switch can not route between the 2 VLANs if it is
> not
> IP. Thus, you bridge them. What I said before about appletalk communicating
> with DECNET I don't think made any sense :)
> >
> > - Joe
> > ----- Original Message -----
> > From: "joe astorino" <joe_astorino@comcast.net>
> > To: "Raghav Bhargava" <raghavbhargava12@gmail.com>
> > Cc: "Cisco certification" <ccielab@groupstudy.com>
> > Sent: Thursday, February 19, 2009 11:44:14 PM GMT -05:00 US/Canada
> Eastern
> > Subject: Re: Fallback Bridging
> >
> > Raghav,
> >
> > The way I understand it is this -- VLANs in general, and thus inter-vlan
> routing on a switch were designed around the IP protocol. Fallback bridging
> basically allows you to bridge non-ip protocols between VLANs. Since it is
> not
> IP it cannot be routed normally like an IP packet between vlans, so it can
> be
> bridged. I hope that helps
> >
> > - Joe
> > ----- Original Message -----
> > From: "Raghav Bhargava" <raghavbhargava12@gmail.com>
> > To: "Cisco certification" <ccielab@groupstudy.com>
> > Sent: Thursday, February 19, 2009 11:27:03 PM GMT -05:00 US/Canada
> Eastern
> > Subject: Fallback Bridging
> >
> > Hi Experts,
> >
> > I was reading Fallback Bridging but somehow could not understand it.
> > Can someone please explain in simple terms.
> >
> > Appreciate all the help..
> >
> > --
> > Warm Regards
> > Raghav
> >
> >
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> >
> >
> >
> >
>
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