From: Greg Schmitt (gschmitt@xxxxxxxxxxxxx)
Date: Fri Jul 19 2002 - 19:47:09 GMT-3
Greetings,
The BVI provides a virtual "interface" to which traffic on "bridged" segment ca
n be forwarded. From this "interface", the formerly
"bridged" traffic can then "routed" out an actual interface that is participati
ng in a routed segment.
Prior to IRB (with its BVI), you could route and bridge on a single router usin
g CRB. However, bridged and routed traffic could
never be mixed. IRB/BVI allows you to mix bridged and routed segments on the sa
me platform.
There's a good discussion on this in 'Cisco Certification Bridges, Routers and
Switches for CCIEs' by Caslow.
Cheers,
Greg
Greg Schmitt, CCIE #8105
Internetwork Solutions Engineer
ThruPoint, Inc.
Cell: 443-822-5183
IM: GregThruPoint
email: GSchmitt@thrupoint.net
-----Original Message-----
From: Anthony Pace [mailto:anthonypace@fastmail.fm]
Sent: Friday, July 19, 2002 6:22 PM
To: gschmitt@thrupoint.net; Diment, Andrew; 'Rich Kleimon';
ccielab@groupstudy.com
Subject: RE: BVI Problem
Greg,
What purpose does the BVI serve other than to provide layer 3
connectivity to a group of bridged interfaces?
Anthony Pace
On Fri, 19 Jul 2002 18:11:31 -0400, "Greg Schmitt"
<gschmitt@thrupoint.net> said:
> Greetings,
>
> One thing to remember on BVI, all protocols except IP are bridged by
> default. IP is routed by default.
>
> Cheers,
>
> Greg
>
> Greg Schmitt, CCIE #8105
>
> Internetwork Solutions Engineer
> ThruPoint, Inc.
> Cell: 443-822-5183
> IM: GregThruPoint
> email: GSchmitt@thrupoint.net
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Anthony Pace
> Sent: Friday, July 19, 2002 5:46 PM
> To: Diment, Andrew; 'Rich Kleimon'; ccielab@groupstudy.com
> Subject: RE: BVI Problem
>
>
> I noticed the same thing as Andy. I think that "bridge 1 bridge ipx" is
> a default and does not display but it allows the IPX traffic to be
> bridged on all the interfaces in Bridge group 1. In order to get the
> BVI connectivity into the BRIDGE-GROUP, you need "bridge 1 route ipx".
>
> These two commands are "per protocole being bridged or routed. Routed,
> means that the BVI will provide a layer 3 address for the whole
> broadcast domain which is the briged interfaces.
>
> The bridge, no bridge, route, no route commands seem to be auto
> generated, depending on the order you do things. (Bridge-group, BVI,
> putting interfaces in the bridge group) and depending if you allready
> had layer 3 interfaces for a particular protocole on a particular
> interface.
>
> Also; isn't it necessary to disable the IPX reserved netwok of FFFFFFE
> if you want to actually use it fot your LAN?
>
> Anthony Pace
>
>
> On Fri, 19 Jul 2002 15:38:19 -0500, "Diment, Andrew"
> <adiment@qwest.com> said:
> > I assume you are saying it's not passing IP because there is no "bridge
> > 1
> > route ipx". This should work. Looking at the "show ver" I notice the
> > router has been up for 2 days. Did you try to reboot the router? I
> > have
> > found if you are making changed and it looks like it should work but
> > doesn't
> > a reboot will usually fix it.
> >
> > Andy
> >
> > -----Original Message-----
> > From: Rich Kleimon [mailto:richard_kleimon@qwest.net]
> > Sent: Friday, July 19, 2002 1:37 PM
> > To: ccielab@groupstudy.com
> > Subject: BVI Problem
> >
> >
> > Having trouble with a BVI. I know this should work because I have done
> > it on
> > different equip.. It doesn't pass any traffic.
> > Any thoughts?
> >
> > bridge irb
> >
> > interface FastEthernet1/0
> > no ip address
> > no ip directed-broadcast
> > full-duplex
> > !
> > interface FastEthernet1/0.10
> > encapsulation isl 10
> > ip address 135.6.32.6 255.255.255.0
> > no ip redirects
> > no ip directed-broadcast
> > ipx encapsulation NOVELL-ETHER
> > ipx network 56
> > !
> > interface FastEthernet1/0.20
> > encapsulation isl 20
> > no ip redirects
> > no ip directed-broadcast
> > bridge-group 1
> > !
> > interface FastEthernet1/0.40
> > encapsulation isl 40
> > no ip redirects
> > no ip directed-broadcast
> > bridge-group 1
> > !
> > interface BVI1
> > ip address 135.6.33.6 255.255.255.0
> > no ip directed-broadcast
> > ipx network FFFFFFFE
> >
> > bridge 1 protocol ieee
> > bridge 1 route ip
> >
> >
> > R6#sh ver
> > Cisco Internetwork Operating System Software
> > IOS (tm) C2600 Software (C2600-JS-M), Version 12.0(21a), RELEASE
> > SOFTWARE
> > (fc1)
> > Copyright (c) 1986-2002 by cisco Systems, Inc.
> > Compiled Sat 02-Feb-02 00:58 by nmasa
> > Image text-base: 0x80008088, data-base: 0x80B1D42C
> >
> > ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
> >
> > R6 uptime is 2 days, 4 hours, 27 minutes
> > System restarted by power-on
> > System image file is "flash:c2600-js-mz.120-21a.bin"
> >
> > cisco 2610 (MPC860) processor (revision 0x202) with 29696K/3072K bytes
> > of
> > memory.
> > Processor board ID JAD04011VDX (943008882)
> > M860 processor: part number 0, mask 49
> > Bridging software.
> > X.25 software, Version 3.0.0.
> > SuperLAT software (copyright 1990 by Meridian Technology Corp).
> > TN3270 Emulation software.
> > 1 Ethernet/IEEE 802.3 interface(s)
> > 1 FastEthernet/IEEE 802.3 interface(s)
> > 1 Serial network interface(s)
> > 2 Serial(sync/async) network interface(s)
> > 32K bytes of non-volatile configuration memory.
> > 8192K bytes of processor board System flash (Read/Write)
> >
> > Configuration register is 0x2102
> >
> >
> > Console> (enable) sh port 1/2
> > Port Name Status Vlan Level Duplex Speed Type
> > ----- ------------------ ---------- ---------- ------ ------ -----
> > ------------
> > 1/2 connected trunk normal full 100
> > 100BaseTX
> >
> > Port Security Secure-Src-Addr Last-Src-Addr Shutdown Trap
> > IfIndex
> > ----- -------- ----------------- ----------------- -------- --------
> > -------
> > 1/2 disabled No disabled 4
> >
> > Port Broadcast-Limit Broadcast-Drop
> > -------- --------------- --------------
> > 1/2 - -
> >
> > Port Status Channel Channel Neighbor
> > Neighbor
> > mode status device port
> > ----- ---------- --------- ----------- -------------------------
> > ----------
> > 1/2 connected auto not channel
> >
> > Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
> > ----- ---------- ---------- ---------- ---------- ---------
> > 1/2 8 13 0 21 0
> >
> > Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts
> > Giants
> > ----- ---------- ---------- ---------- ---------- --------- ---------
> > ---------
> > 1/2 1 0 0 0 0 2
> > -
> >
> > Last-Time-Cleared
> > --------------------------
> > Sat Jul 6 2002, 18:27:39
> >
> > Console> (enable) sh ver
> > WS-C5000 Software, Version McpSW: 4.5(13a) NmpSW: 4.5(13a)
> > Copyright (c) 1995-2002 by Cisco Systems
> > NMP S/W compiled on Feb 4 2002, 16:46:59
> > MCP S/W compiled on Feb 04 2002, 16:48:19
> >
> > System Bootstrap Version: 2.4(1)
> >
> > Hardware Version: 2.1 Model: WS-C5000 Serial #: 007408581
> >
> > Mod Port Model Serial # Versions
> > --- ---- ---------- --------- ----------------------------------------
> > 1 2 WS-X5509 007408581 Hw : 2.1
> > Fw : 2.4(1)
> > Fw1: 2.4(1)
> > Sw : 4.5(13a)
> > 2 12 WS-X5213A 005150972 Hw : 1.1
> > Fw : 1.4
> > Sw : 4.5(13a)
> >
> > DRAM FLASH NVRAM
> > Module Total Used Free Total Used Free Total Used Free
> > ------ ------- ------- ------- ------- ------- ------- ----- -----
> > -----
> > 1 16384K 10163K 6221K 8192K 3840K 4352K 256K 113K
> > 143K
> >
> > Uptime is 12 days, 17 hours, 35 minutes
> > Console> (enable)
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