Cisco WAN :: 2960 Buffers (drops / Packet Loss Due To Micro-bursts)?

Dec 21, 2011

Have a pair of 2960's in a stack, one port(trunk) connects to another DC and we are seeing ~5% packet-loss and large output drops to this DC.

#sh interfaces gigabitEthernet 1/0/17 counters errors

Port        Align-Err     FCS-Err    Xmit-Err     Rcv-Err  UnderSize  OutDiscards
Gi1/0/17            0           0           0           0          0       182867
GigabitEthernet1/0/17 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is a0cf.5b87.ec11 (bia a0cf.5b87.ec11)
  Description: QinQ_to_DC2

[code]....

As you can see, 30sec rate isnt excessive, but as the drops are outdiscards it would appear we are getting hit by the small buffers/microburst issue.
 
 Gi1/0/17 is mapped to asic 0/20
Gi1/0/17  17   17   17   0/20 1    17   17   local     Yes     Yes

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Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 28    WS-C2960S-24TS-L   12.2(55)SE5           C2960S-UNIVERSALK9-M
 
interface GigabitEthernet1/0/25
switchport trunk allowed vlan 380,382,384,386
switchport mode trunk
duplex full(code)

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[Code].....

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branch#ping 172.31.254.1 source Tunnel 3 repeat 1000Type escape sequence to abort.Sending 1000, 100-byte ICMP Echos to 172.31.254.1, timeout is 2 seconds:Packet sent with a source address of 172.31.254.9!!!!!!!!!!.!!!!!!!!!!.!.!!!!!!.!!!!!..!!!!!!..!!!!!!!!.!!.!!!!!.!!!!!!!!!!!!.!!!!!.!!!.!!!!!!!!!!!..!!!!.!.!.!!!!!.!!!!!!!!!.!..!!!.!.!!!!!.(...)!!!!!!.!!!.!!!!.!!!!.!.!!.!!!!!!!!!!!!!!!.!!.!!!!!!!!!.!!!.!!.!.!!!!!...!!!!!!!!!!..!!!!!!Success rate is 79 percent (795/1000), round-trip min/avg/max = 40/43/568 msbranch#
 
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interface Tunnel0 description Testing (DMVPN) bandwidth 10000 ip address 172.31.254.1 255.255.255.192 no ip redirects ip mtu 1400 ip nhrp authentication testing ip nhrp map multicast dynamic ip nhrp network-id 1 ip nhrp holdtime 600 ip nhrp redirect ip tcp adjust-mss 1360 no ip split-horizon eigrp 1 tunnel source FastEthernet1 tunnel mode gre multipoint tunnel key 100003 tunnel bandwidth transmit 10000 tunnel bandwidth receive 10000 tunnel protection ipsec profile secure_profile shared
 
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interface Tunnel3 description Testing (DMVPN) bandwidth 2000 ip address 172.31.254.9 255.255.255.192 no ip redirects ip mtu 1400 ip nhrp authentication testing ip nhrp map multicast 1.1.1.1 ip nhrp map 172.31.254.1 1.1.1.1 ip nhrp network-id 1 ip nhrp holdtime 300 ip nhrp nhs 172.31.254.1 ip nhrp shortcut ip nhrp redirect ip tcp adjust-mss 1360 no ip split-horizon eigrp 1 delay 1000 tunnel source GigabitEthernet0/0 tunnel mode gre multipoint tunnel key 100003 tunnel bandwidth transmit 2000 tunnel bandwidth receive 2000 tunnel protection ipsec profile secure_profile shared
 
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