From: Nitro Drops (nitrodrops@hotmail.com)
Date: Fri Feb 27 2009 - 02:50:46 ARST
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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