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Jan
15
comment Basic multicast network performance problems
Might be. Might be worth testing, to see if it is that that's killing your CPU (probably out of hours, though). Can't say I've seen it in the 4900, but I have certainly seen packet-loss due to te presence of IGMP snooping on 4ESW ports.
Jan
13
comment Basic multicast network performance problems
Might be worth disabling IGMP snooping, I've seen issues due to that on other platforms (though that was packet loss rather than latency).
Jan
12
answered Basic multicast network performance problems
Jan
11
answered How much does a IPtables router slow down a connection?
Jan
10
comment BVI vs Bridge routers
@George Bailey: The ability for the router to interact with the interfaces on a Layer 3 level (or, as far as I recall at least). The "BVI interface" is, essentially, the same as the "Interface VLAN" on a switch (the SVI).
Jan
10
answered Confusion about TCP packet analysis terms
Jan
9
comment Is an Ethernet point to point connection without a switch real time capable?
It depends on the hardware. I have seen collisions on 10BaseT and 100BaseT, where (at least) one end had sufficient cross-bleed between the Rx and Tx elements. I'd say "there can't be any collisions for full-duplex point-to-point ethernet".
Jan
8
comment Does Removing a WIC from a Cisco router ever effect the Saved Configuration?
If I'd been able to give an extra +1 for "also copy the config off to somewhere else", I would've, as is I could only give one +1 for the general answer.
Jan
8
comment Cisco IOS: access-list logging rate-limited or missed packets
I believe that is a minimum time between ACL log messages. Basically, you need to allow more log messages to be generated. But, the 871 is not the fastest hardware platform around and I don't know if "have ACL" directly implies "process-switched" or not. You may actually be on the limit of what your hardware can do.
Jan
7
comment Is Internet routing (BGP) fully automated?
RIPE also publishes RR-set information (essentially AS-owner-edited information on each As's routing policy, tehre are automatic tools to build ACL rules to ensure that the routes you accept in correspon exactly to the published RR-set policy, adding another layer of protection for your routing).
Jan
6
revised Cisco router not receiving OSPF updates
Added some vague "debug ospf" data
Jan
6
answered Cisco router not receiving OSPF updates
Jan
6
answered How does UDP track connections?
Jan
3
comment BVI vs Bridge routers
@GeorgeBailey If you have an interface BVI17, all interfaces with "bridge-group 17" will be in the same group and BVI17 will provide the L3 connectivity.
Jan
3
answered Cisco IOS: access-list logging rate-limited or missed packets
Jan
3
answered SSTP BPDU with bad TLV and macflap — info please
Jan
3
answered BVI vs Bridge routers
Dec
24
answered Cisco E1/T1 Time Slot
Dec
23
comment Latency in TCP/IP-over-Ethernet networks
And if you're relying on jumbo frames, remember that you'll need to have jumbo frames enabled end-to-end to get any benefit from them...
Dec
23
comment Sending a UDP message to a computer inside a network
Er? That doesn't make sense, you seem t obe treating L2 addressing (MACs) like L3 addressing (in this case, NAT). The source MAC is always replaced on forwardíng through an L3 device (but shouldn't be, when sent through an L2 device).