Hi Kelly, So, from what we've discussed the stack is half duplex then. In fact, just read your previous post and that's what you said. Doh! To make it full duplex you would need another 3 Gigastack cards and keep it to one cable per module. And in that case, you'd probably be better changing the priorities so that the link between for instance switch 3 and 4 was blocking, so that both uplinks could be used.
In fact, even with the existing set up, is that not a workable idea anyway? Not sure? Your thoughts? Incidentally, those cables are a bit tidy. Does it still work OK like that. Never seen it before. :-) ""Kelly Cobean"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Incidentally, you can see a picture of this configuration at: > > http://home.earthlink.net/~kcobean/workstuff/pics/pic6.jpg or > http://home.earthlink.net/~kcobean/workstuff/pics/pic10.jpg > > As usual, watch for URL wrap. > > > HTH > > Kelly > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Kelly Cobean > Sent: Friday, March 22, 2002 10:21 AM > To: [EMAIL PROTECTED] > Subject: RE: Gigastack Etherchannel [7:39033] > > > Ole, > Here is our configuration....(God I hope this doesn't get screwed up. Just > in case, basically it's a looped configuration, using only one of the gig > ports per switch, utilizing the second gig port on the 1st and 9th switch > for uplink to the distribution layer. Gig0/2 on switches 2-8 are unused. > The loop prevention mechanism in the IOS takes care of the loop > configuration in the stack(what I read leads me to believe that it is > something other than STP, but I could be wrong) then STP takes care of the > loop in the two fiber uplinks, which connect to two different Cat6509's) > > ||(fiber uplink to distribution layer) > || > Switch1 |oo| |oo| > || > / |--- > ----- | > | | > Switch2 |oo| |oo| | > | | > / | > | | > Switch3 |oo| |oo| | > | | > / | > | | > Switch4 |oo| |oo| | > | | > / | > | | > Switch5 |oo| |oo| | > | | > / | > | | > Switch6 |oo| |oo| | > | | > / | > | | > Switch7 |oo| |oo| | > | | > / | > | | > Switch8 |oo| |oo| | > | | > / | > | | > Switch9 |oo| |oo| | > | || | > ---------- > || > || (Uplink to Distibution Layer > > > Hope this helps, > Kelly Cobean, CCNP, CCSA, ACSA, MCSE, MCP+I > Network Engineer > GRC International, Inc., an AT&T company > > > > > -----Original Message----- > From: Ole Drews Jensen [mailto:[EMAIL PROTECTED]] > Sent: Friday, March 22, 2002 8:51 AM > To: 'Kelly Cobean'; [EMAIL PROTECTED] > Subject: RE: Gigastack Etherchannel [7:39033] > > > Kelly, > > On the GigaStack modules, are you using both ports on the module, or one > port on two modules? > > Examples (use fixed font for best view): > > 1 module / 2 ports > > switch 1 [oo] [--] > | > switch 2 [oo] [--] > | > switch 3 [oo] [--] > | > switch 4 [oo] [--] > > 2 modules / 1 port > > switch 1 [oo] [oo] > | > switch 2 [oo] [oo] > | > switch 3 [oo] [oo] > | > switch 4 [oo] [oo] > > Thanks, > > Ole > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Ole Drews Jensen > Systems Network Manager > CCNP, MCSE, MCP+I > RWR Enterprises, Inc. > [EMAIL PROTECTED] > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > http://www.RouterChief.com > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Need a Job? > http://www.OleDrews.com/job > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > -----Original Message----- > From: Kelly Cobean [mailto:[EMAIL PROTECTED]] > Sent: Friday, March 22, 2002 7:18 AM > To: [EMAIL PROTECTED] > Subject: RE: Gigastack Etherchannel [7:39033] > > > Guys, If it helps any, here is a quote from Cisco's web site....Link below. > > "Cascaded Stack Connections: > You can connect from three to nine switches in a cascaded stack > configuration. The cascaded stack operates in half-duplex mode." (This > raises the debate about how many switches in the stack again, because now > I've seen conflicting documentation that indicates 9 and 16) > > The link is > http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/gbic/ig_gbic/mam > oins.htm#xtocid357911 > Watch for URL wrap. > > Our Switchstacks contain 9 3548's here, and the uplink ports with fiber GBIC > modules default to full duplex, while the gigastack module ports default to > half duplex. I think one of reasons for this is the fact that you are > effectively splitting the port in half by connecting each of the two > gigastack ports to different switches. Hope this helps. > > Kelly Cobean, CCNP, CCSA, ACSA, MCSE, MCP+I > Network Engineer > GRC International, Inc., an AT&T company > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Gaz > Sent: Thursday, March 21, 2002 2:01 PM > To: [EMAIL PROTECTED] > Subject: Re: Gigastack Etherchannel [7:39033] > > > Ole, > > Good question.......... Dunno! > > I was just going to suggest that one 3548 could only talk to one other > switch at full duplex. The Gigastack bus may equate to a shared media once > another switch is attached, so needs to go to half duplex. > This must be different for something like a 3508, as a 3508 can definitely > take multiple full duplex connections when used as the hub of a star > configuration. > > In fact now I've finished writing it, it seems reasonable. I will test this > tomorrow as well. > > Anybody pick holes in that theory? > > > Gaz > > > > ""Ole Drews Jensen"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > If you have three 3548's - A, B and C, and you have 1 GigaStack module in > A > > where only one connector is connected to one connector on a GigaStack > module > > in B, and 1 GigaStack module in C where only one connected is connected to > > one connector on a second GigaStack module in B. Would that make a Full > > Duplex on the connections since only one port is used on each GigaStack > > module, or would it end up in Half Duplex anyway, since you have a total > of > > three switches? > > > > Ole > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Ole Drews Jensen > > Systems Network Manager > > CCNP, MCSE, MCP+I > > RWR Enterprises, Inc. > > [EMAIL PROTECTED] > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > http://www.RouterChief.com > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Need a Job? > > http://www.OleDrews.com/job > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > > > > > > -----Original Message----- > > From: Georgescu, Aurelian [mailto:[EMAIL PROTECTED]] > > Sent: Thursday, March 21, 2002 11:56 AM > > To: [EMAIL PROTECTED] > > Subject: RE: Gigastack Etherchannel [7:39033] > > > > > > They can be used in full-duplex mode on point-to-point links (aka using > only > > one connector on each GigaStack, one at each end of the cable). If you > > daisy-chain them they default to half-duplex. > > > > Aurelian > > > > -----Original Message----- > > From: Ole Drews Jensen [mailto:[EMAIL PROTECTED]] > > Sent: Thursday, March 21, 2002 12:02 PM > > To: [EMAIL PROTECTED] > > Subject: RE: Gigastack Etherchannel [7:39033] > > > > GigaStack GBIC's are Full Duplex: > > > > ELVIS#show int gigabitEthernet 0/1 > > GigabitEthernet0/1 is up, line protocol is up > > Hardware is Gigabit Ethernet, address is 0002.fd13.52f1 (bia > > 0002.fd13.52f1) > > MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, > > reliability 255/255, txload 1/255, rxload 1/255 > > Encapsulation ARPA, loopback not set > > Keepalive not set > > Auto-duplex (Full), link type is autonegotiation, media type is > > CX_GIGASTACK > > output flow-control is off, input flow-control is off > > ARP type: ARPA, ARP Timeout 04:00:00 > > GigaStack module(0.2) in GBIC slot. link1 is up, link2 is down > > Last input 00:00:06, output 00:00:01, output hang never > > Last clearing of "show interface" counters 11w1d > > Queueing strategy: fifo > > Output queue 0/40, 0 drops; input queue 0/75, 0 drops > > 5 minute input rate 107000 bits/sec, 15 packets/sec > > 5 minute output rate 91000 bits/sec, 16 packets/sec > > 122086095 packets input, 1719966070 bytes, 0 no buffer > > Received 3149732 broadcasts, 0 runts, 0 giants, 0 throttles > > 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored > > 0 watchdog, 163799 multicast, 0 pause input > > 165588418 packets output, 149633091 bytes, 0 underruns > > 0 output errors, 0 collisions, 0 interface resets > > 0 babbles, 0 late collision, 0 deferred > > 0 lost carrier, 0 no carrier, 0 pause output > > 0 output buffer failures, 0 output buffers swapped out > > > > Hth, > > > > Ole > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Ole Drews Jensen > > Systems Network Manager > > CCNP, MCSE, MCP+I > > RWR Enterprises, Inc. > > [EMAIL PROTECTED] > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > http://www.RouterChief.com > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Need a Job? > > http://www.OleDrews.com/job > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > > > > > > -----Original Message----- > > From: Jeffrey Reed [mailto:[EMAIL PROTECTED]] > > Sent: Thursday, March 21, 2002 10:22 AM > > To: [EMAIL PROTECTED] > > Subject: RE: Gigastack Etherchannel [7:39033] > > > > > > I'm not sure, but I thought I read somewhere that the GigaStack GBICs are > > half duplex. I think I read somewhere that you shouldn't use them in an > > environment that requires QOS. If this is true, your throughput would be > > better with 1000B-T GBICs or Fiber GBICs running at full duplex. > > > > Jeffrey Reed > > Classic Networking, Inc. > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Gaz > > Sent: Thursday, March 21, 2002 10:16 AM > > To: [EMAIL PROTECTED] > > Subject: Gigastack Etherchannel [7:39033] > > > > Hi all, > > > > Been searching all over CCO for this info....anybody know for sure? > > > > > > Using Gigastack, can both slots be used as "Gigastack Etherchannel" (ie > all > > four ports (two on each module)) to provide 4Gb link. > > > > Scenario would be a 3508 with two Gigastack modules and 3548 with two > > Gigastack modules - connected with four gigastack cables. > > Various web pages show 2Gb full duplex using Gigastack and also mention > 4Gb > > Full Duplex using Gigabit Ethernet. Even though the latter was on a > > Gigastack data sheet, it was worded as though (or could mean) an > alternative > > was to use Gigabit Ethernet at 4Gb. > > > > Hopefully I've got the question over - Basically, I know 4Gb is possible > > with fibre SX/LX etc, but what about Gigastack? > > > > Thanks, > > > > Gaz Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=39178&t=39033 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
