Hello everyone,
I'm facing a issue which is making me to have nigthmare.
To give an image of the architecture :
|----Cust_LAN---| RIverbed | SWitch | --- CPE 1 | ----Int g0 is the interface to the WAN ---------> PE1 [BACKBONE L3VPN]
| |
| | Back-to-back
|----Cust_LAN-------------------| SWitch | --- CPE 2 | | ----Int g0 is the interface to the WAN ---------> PE2 [BACKBONE L3VPN]
BGP is the protocol configured between CPEs and PEs. There is loadbalancing on CPE 1 via an ebgp session to PE1 and a ebgp session to PE2 via the back-to-back interface . See the configuration part (X.X.X.X is the loopback of PE1 and Y.Y.Y.Y is the loopback of PE2)
router bgp 65000
bgp log-neighbor-changes
redistribute connected
neighbor X.X.X.X remote-as 65001
neighbor X.X.X.X timers 15 45
neighbor X.X.X.X soft-reconfiguration inbound
neighbor Y.Y.Y.Y remote-as 65001
neighbor Y.Y.Y.Y ebgp-multihop 2
neighbor Y.Y.Y.Y timers 15 45
neighbor Y.Y.Y.Y soft-reconfiguration inbound
maximum-paths 2
I'm learning a default route and I'm seeing that the loadbalancing is in action.
On the gig0 interfaces i've configured only the shaping to allow 10 Mbps. This means that on CPE 1 i can send an amount of trafic of 20 Mbps.
Our customer are facing slow trafic on that site. After troubleshooting i saw output drops on CPE 1 and CPE2 which is not normal for me because the test I did with a customer , is to connect a PC to CPE1 and use their application and send traffic to their central site.
The latency is 50 s , when the customer is using another Service provider with 2Mbps to the same central site the delay is 27 s.
The curious thing is that i've output drops on the interface as you can see :
sh int g0
GigabitEthernet0 is up, line protocol is up
Hardware is PQII_PRO_UEC, address is a44c.1142.cfb0 (bia a44c.1142.cfb0)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 100Mbps, media type is LX10
output flow-control is XON, input flow-control is XON
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:24, output 00:00:00, output hang never
Last clearing of "show interface" counters 17:51:50
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 677
Queueing strategy: Class-based queueing
Output queue: 0/1000/0 (size/max total/drops)
30 second input rate 224000 bits/sec, 58 packets/sec
30 second output rate 301000 bits/sec, 264 packets/sec
1940801 packets input, 593963220 bytes, 0 no buffer
Received 1072 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
6536291 packets output, 993828067 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
Show policy-map int g0
GigabitEthernet0
Service-policy output: SHAPER-GAB0-DEFAULT-WAN
Class-map: CLASS-ALL (match-any)
6554984 packets, 1002760124 bytes
30 second offered rate 816000 bps, drop rate 0 bps
Match: any
Queueing
queue limit 64 packets
(queue depth/total drops/no-buffer drops) 0/677/0
(pkts output/bytes output) 6554307/1002107056
shape (average) cir 10000000, bc 40000, be 40000
target shape rate 10000000
Class-map: class-default (match-any)
0 packets, 0 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: any
queue limit 64 packets
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts output/bytes output) 0/0
With 20 Mbps we should have such a behaviour . Note : the CPE's are cisco892F.
Can anyone help me to fix that weird issue ? Need help.
Thank you.
