Cisco Application :: Ace 20 Total Number Of Concurrent Sessions Sudden Drop
Jul 18, 2012
I´m detecting on my ACE 20.
I´m monitoring the total number of concurrent sessions of my ACE 20 (using Cacti), and from time to time, with no discernable pattern, I see an instant drop of sessions to half...I don´t detect any disturbance with our traffic and service, I have no complaints, but it's a very accentuated drop.
I´m able to get 1 or 2 days withouth any suddent drop of connections, and then for no reason I pass from 500.000 to 200.000 sessions in a minute. Then they gradually go up again.
I´ve seen in ACE´s session table that she keeps a great number of half-open, or closed sessions, and those are counted as part of concurrent sessions. Is there any flush on ACE´s table when she reaches a certain number of closed TCP sessions or something like that?
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Nov 15, 2012
in Cisco ASA 5540 Adaptive Security Appliance Platform Capabilities and Capacities, I see Concurrent Sessions: 400,000. Which mean what device can handle 400,000 session and no more. But if I'm using TCP State Bypass Feature (Inbound traffic pass via ASA but Outbound goes via different device). I can see such connections via show conn command with b flag.
My questions: 1. Will this limit (Concurrent Session) affect in this case? Or ASA can handle more such connections (for example 800,000 ...) in bypass state? 2. It's possible to tune timeout for such connection without using global timeout conn? My problem what I want to do by pass tcp connection for one IP with has very high connection/sec rate.
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SWESAN1-1#sh interfaces gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is ec44.763c.8f01 (bia ec44.763c.8f01)MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 5/255Encapsulation ARPA, loopback not setKeepalive set (10 sec)Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTXinput flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00Last input never, output 00:00:08, output hang neverLast clearing of "show interface" counters 03:25:04Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 78Queueing strategy: fifoOutput queue: 0/40 (size/max)5 minute input rate 22322000 bits/sec, 2171 packets/sec5 minute output rate 5155000 bits/sec, 1487 packets/sec20441503 packets input, 23941254166 bytes, 0 no bufferReceived 0 broadcasts (0 multicasts)0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored0 watchdog, 0 multicast, 0 pause input0 input packets with dribble condition detected16323602 packets output, 9608971046 bytes, 0 underruns0 output errors, 0 collisions, 0 interface resets0 babbles, 0 late collision, 0 deferred0 lost carrier, 0 no carrier, 0 PAUSE output0 output buffer failures, 0 output buffers swapped out
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SWCIACTCT05#sh int gi1/0/47 | i Total output drops:
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6487344
SWCIACTCT05#sh int gi1/0/47 | i Total output drops:
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6487344
SWCIACTCT05#sh int gi1/0/47 | i Total output drops:
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6487344
[code]....
I checked and found two registered bug id: CSCtq86186 / CSCso81660.I would like to know what is the best IOS version to update my switch, IOS 15.0.2 SE2 or 12.2.58 SE2, by the way, my environment is very critical (data center) and the version 15.0.2 SE2 is very recent, but its stable ?In both versions the problem are fixed?
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cisco6#show interfaces gigabitEthernet 0/38
GigabitEthernet0/38 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 58bc.2746.45a6 (bia 58bc.2746.45a6)
[Code].....
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