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Cisco 1900 acceptable memory leaks quantity and CPU troubleshooting?

Vadym Belyayev
Level 1
Level 1

Hello all,

I am troubleshooting memory leaks and buffers issues on my 1900 and had some doubts regarding the problems that my router causes.

Intermitently during the day for no reason the gig0/0 interface connected to ISP stops responding from our management network

(log shows that the interface goes down).  The ISPs modem responds fine from my management network.

The issue goes away by itself in 20 minutes, sometimes more or after a hard reboot.

Sometimes a router would increment a throttle value to 1. When running for 4 days without a reboot, the router raised 39 throttles and 57 input drops.

The CPU usage during reboot is 100%:

     778897778942988882637879090686766666856555667666666766666656

  100                        ****

   90                        **#*

   80                        **##

   70                        *###

   60                        *###*

   50      *    *            *###*

   40      *    *            *###*

   30      *    *            ####*

   20      *    *            ####*

   10 *****#****#************#####********************************

     0....5....1....1....2....2....3....3....4....4....5....5....6

               0    5    0    5    0    5    0    5    0    5    0

               CPU% per minute (last 60 minutes)

              * = maximum CPU%   # = average CPU%

The buffers are like this:

Public buffer pools:

Small buffers, 104 bytes (total 153, permanent 50, peak 224 @ 00:26:53):

     149 in free list (20 min, 150 max allowed)

     1523588 hits, 1741 misses, 906 trims, 1009 created

     846 failures (0 no memory)----------Altough it was about 1200000 before a reboot.

Middle buffers, 600 bytes (total 92, permanent 25, peak 92 @ 00:45:41):

     86 in free list (10 min, 150 max allowed)

     65702 hits, 384 misses, 0 trims, 67 created

     329 failures (0 no memory)

Big buffers, 1536 bytes (total 62, permanent 50, peak 62 @ 00:05:06):

     61 in free list (5 min, 150 max allowed)

     18865 hits, 220 misses, 6 trims, 18 created

     212 failures (0 no memory)

Memory leak shows the following:

Biblio_Cane#show memory debug leaks

Adding blocks for GD...

                 I/O memory

Address   Size   Alloc_pc PID Alloc-Proc       Name

                 Processor memory

Address   Size   Alloc_pc PID Alloc-Proc       Name

2722DDA0     1076 210CCBD8 0   *Init*         *Init*

The router is running Version 15.1(2)T4 and I was not able to find any caveats on cisco web page (although I havent used the bug finder tool)

Is this only leak I found a reason to start worrying or I can disregard it and continue basic troubleshooting (change cable and plug my ISP to another port)

Thanks a lot!!

2 Accepted Solutions

Accepted Solutions

Reza Sharifi
Hall of Fame
Hall of Fame

Hi,

Memory leak is not good.  don't ignore it. If you do, it will most likely crash your router.  You can try loading a different version of IOS and watch the memory leak again.  If it happens with another IOS, RMA the router to Cisco for replacement.

HTH

View solution in original post

Memory leaks are mostly software-caused.

View solution in original post

3 Replies 3

Reza Sharifi
Hall of Fame
Hall of Fame

Hi,

Memory leak is not good.  don't ignore it. If you do, it will most likely crash your router.  You can try loading a different version of IOS and watch the memory leak again.  If it happens with another IOS, RMA the router to Cisco for replacement.

HTH

Thank you Reza,

I thought that memory leaks are only software related. Are you telling me that it may be something within the hardware?

Memory leaks are mostly software-caused.