Hi guys,
My client network is running on OSPF routing protocol.I was required to integrate one Multi-layer switch into the current network. Our client wanted a port-channel trunk to be configured for integration with the current live network.The first step taken by me was to ensure that the port-channel is up as it is just a directly connected network from the MLS to customer LAN switch. There are multiple trunk port on the LAN switch that carry the same Vlans as the port-channel trunk. Once the port-channel was configured, our customer complained that the network traffics dropped at one network element (Border Router). The Border Router is also connected to the same LAN switch. When i check the border router configuration, default information originate command parameter is configured and the static default route is pointing to one firewall which is also connected to the same LAN switch. When i check the newly-configured port-channel, there were a lot of output traffics but no input traffics. All the traffics come to the new MLS instead of going to the firewall. I wondered why this happened because ospf is not yet enable on the MLS interface. When i removed the port-channel and let it run on a single physical link, there is no service interruption. I have cleared the mac of that particular Vlans, changed switchport and changed cable but the problem still persist. Please help me on this as our customer is asking for the root cause. Please find the port-channel configuration as attached. The configuration of port-channel 5 on the LAN switch is similar to the port-channel 5 configured on the MLS.
interface Port-channel5
description EtherChannel for Gi Primary
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 150,152,154,164,182,188,190,192
switchport mode trunk
switchport nonegotiate
no ip address
!
interface FastEthernet0/42
description Connection-to-GGSH2-0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 150,152,154,164,182,188,190,192
switchport mode trunk
no ip address
switchport nonegotiate
duplex full
speed 100
channel-group 5 mode on
!
interface FastEthernet0/43
description Connection-to-GGSH2-0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 150,152,154,164,182,188,190,192
switchport mode trunk
no ip address
switchport nonegotiate
duplex full
speed 100
channel-group 5 mode on
SHTMSGSW1#sh int port-channel 5
Port-channel5 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 000d.65a4.5daa (bia 000d.65a4.5daa)
Description: EtherChannel for Gi Primary
MTU 1500 bytes, BW 200000 Kbit, DLY 100 usec,
reliability 255/255, txload 2/255, rxload 1/255
Encapsulation ARPA, loopback not set
Full-duplex, 100Mb/s
input flow-control is off, output flow-control is off
Members in this channel: Fa0/42 Fa0/43
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:01:41, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 2072000 bits/sec, 1441 packets/sec
1997329 packets input, 572096904 bytes, 0 no buffer
Received 489947 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 483945 multicast, 0 pause input
0 input packets with dribble condition detected
417112222 packets output, 1883053558 bytes, 0 underruns
0 output errors, 0 collisions, 12 interface resets
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
Thanks,
Sam
