Symantec Ghost across VLANS routed by cisco router
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From: amfony on 30 Apr 2006 03:50 Thats the problem, i got it to work by reading from this community and added the lines "ip pim sparse-dense" to all vlan related interfaces. Now my problem is that my symantec ghost sessions went from approx 5 - 7 minutes to now 20 - 30 mintues. Thats unacceptable as anyone can see. What has gone wrong and why would this occur if my router is 2821, which has dual gigabit ethernet ports. Thanks for your time.
From: Mark Williams on 1 May 2006 11:17 Is the time difference you mentioned the difference between single-vlan multicasting and routed multicast traffic? Or did you mean the difference between unicast and routed multicast? Ghost adjusts its multicast rate to the slowest system in the network (the Master Client). With multicasting enabled, Ghost may be reaching a very slow client on your net that you didn't see before. Even though you have gigabit ethernet ports, routing the multicast traffic will introduce some latency that wasn't present on a single VLAN.
From: jbrunner007 on 1 May 2006 14:34 even though the 2821 may have gigabit ports, it is unlikely that it has that much throughput capabilities (125MB per second). it probably has about 60 Mbps of forwarding capacity, so one asks why the gigabit interfaces to begin with - a marketing ploy by Cisco to make you think you're getting a big boy router! Well you need a layer 3 switch like the 3750 to alleviate these problems... or ghost within on vlan ! Mark Williams wrote: > Is the time difference you mentioned the difference between single-vlan > multicasting and routed multicast traffic? Or did you mean the > difference between unicast and routed multicast? > > Ghost adjusts its multicast rate to the slowest system in the network > (the Master Client). With multicasting enabled, Ghost may be reaching a > very slow client on your net that you didn't see before. Even though > you have gigabit ethernet ports, routing the multicast traffic will > introduce some latency that wasn't present on a single VLAN.
From: MC on 1 May 2006 18:46 jbrunner007(a)hotmail.com wrote: > even though the 2821 may have gigabit ports, it is unlikely that it has > that much throughput capabilities (125MB per second). it probably has > about 60 Mbps of forwarding capacity, so one asks why the gigabit > interfaces to begin with - a marketing ploy by Cisco to make you think > you're getting a big boy router! > > Well you need a layer 3 switch like the 3750 to alleviate these > problems... or ghost within on vlan ! > > Mark Williams wrote: > >>Is the time difference you mentioned the difference between single-vlan >>multicasting and routed multicast traffic? Or did you mean the >>difference between unicast and routed multicast? >> >>Ghost adjusts its multicast rate to the slowest system in the network >>(the Master Client). With multicasting enabled, Ghost may be reaching a >>very slow client on your net that you didn't see before. Even though >>you have gigabit ethernet ports, routing the multicast traffic will >>introduce some latency that wasn't present on a single VLAN. > > where did you getthose specs on the 2821 router ? We got one and actual throughput testing on our netowrk showed much higher than that. I would like to see what the listed performance specs are supposed to be, Thanks
From: Walter Roberson on 2 May 2006 00:04
In article <x2w5g.25146$iB2.22070(a)bignews4.bellsouth.net>, MC <mwclarke1(a)yahoo.com> wrote: >where did you getthose specs on the 2821 router ? >We got one and actual throughput testing on our netowrk showed much >higher than that. >I would like to see what the listed performance specs are supposed to be, http://www.cisco.com/warp/public/765/tools/quickreference/routerperformance.pdf 2821: 90,000 pps CEF, 87.04 megabit/s |