Loss of connectivity

cisco_troublecisco_trouble Posts: 78Inactive Imported Users ■■□□□□□□□□
Hi there people.

I'm managing a couple of 1700 routers. Im using HP Openview as a monitoring tool. I just cant figure out why i cant connect remotely. When it does come back up, it shows the router has been always up, but there are interface resets. no errors, crc or anything. However, at the time of loss of connectivity, it seems that the router is heavily over-utilizing? Could that be the problem? Any suggestions?

Assuming all configs and links are 100%

thanx in advance
"To strive, to seek, to find, and not to yield."

Comments

  • EdTheLadEdTheLad Posts: 2,112Member
    Hi there people.

    I'm managing a couple of 1700 routers. Im using HP Openview as a monitoring tool. I just cant figure out why i cant connect remotely. When it does come back up, it shows the router has been always up, but there are interface resets. no errors, crc or anything. However, at the time of loss of connectivity, it seems that the router is heavily over-utilizing? Could that be the problem? Any suggestions?

    Assuming all configs and links are 100%

    thanx in advance

    I havent really used Openview with cisco, the only things i can think of is
    make sure your IOS and MIB releases are compatable.
    If yes i would still try a different MIB, are you using a generic MIB or the actuall 1700 MIB?
    Networking, sometimes i love it, mostly i hate it.Its all about the $$$$
  • cisco_troublecisco_trouble Posts: 78Inactive Imported Users ■■□□□□□□□□
    The MIBs are fine. Could it be the cpu? When the router CPU starts running high, packets destined for the router itself (such as management traffic from HPOV), will queue up waiting for the CPU to free up. Could over-utilization do this? and if so, how will one go about solving this problem, other than replacing it with 10 000 series router :P
    "To strive, to seek, to find, and not to yield."
  • EdTheLadEdTheLad Posts: 2,112Member
    The MIBs are fine. Could it be the cpu? When the router CPU starts running high, packets destined for the router itself (such as management traffic from HPOV), will queue up waiting for the CPU to free up. Could over-utilization do this? and if so, how will one go about solving this problem, other than replacing it with 10 000 series router :P

    For sure the CPU can be creating this problem.But as i dont have experience
    with this i cant advice what to do,sorry.Someone else ???
    Networking, sometimes i love it, mostly i hate it.Its all about the $$$$
  • keenonkeenon Posts: 1,921Member ■■■■□□□□□□
    most monitoring programs use ping for to verify that device is active but use a bulk_snmp_get to pull stats. which i have seen cause unstablity on some devices. this sounds like the case for your 1700. my first thought is try to pull less information via snmp.
    Become the stainless steel sharp knife in a drawer full of rusty spoons
  • wildfirewildfire Posts: 654Member
    Theres a bolt on for HPOV that shows the CPU usage, question though are u pulling the full mib table for your updates ? or just the ones you need?

    How much work is the router actually doing the 1700 series was really designed as a remote site and with modern applications etc its more of a soho device than anything esle. Is involved in routing? if so and it only has one connection why not replace the routing protocol with static or default routes?

    Is it running cpu intensive stuff such as NAT, is it logging to the buffers? all factors to consider and tweak.
    Looking for CCIE lab study partnerts, in the UK or Online.
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