Port-channel configuration in 5545-x ?

[bensonlei]

Hi, all,

A port-channel configuration in 5545-x, and the show interfaces as the following, just would like to know if the VLAN1 has 1G bandwidth or the port-channel has 1G bandwidth, thx ?

----Port-Channel configuration ----------------

interface GigabitEthernet0/2
 speed 1000
 channel-group 1 mode active
 flowcontrol send on
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/3
 speed 1000
 channel-group 1 mode active
 flowcontrol send on
 no nameif
 no security-level
 no ip address

interface Port-channel1
 description OA Servers
 speed 1000
 lacp max-bundle 8
 nameif vlan1
 security-level 50
 ip address 192.168.100.4 255.255.255.0
!

interface Port-channel1.5
 description Email Servers
 vlan 5
 nameif vlan5
 security-level 50
 ip address 192.168.110.4 255.255.255.0
!

--------show interfaces ----------------- 

ASA5545-x/act# sh int vlan1
Interface Port-channel1 "vlan1", is up, line protocol is up
  Hardware is EtherChannel/LACP, BW 2000 Mbps, DLY 10 usec
 Auto-Duplex(Full-duplex), 1000 Mbps(1000 Mbps)
 Input flow control is unsupported, output flow control is off
 Description: OA Servers
 MAC address a00c.0001.600f, MTU 1500
 IP address 192.168.100.4, subnet mask 255.255.255.0
  Traffic Statistics for "vlan1":
 610385 packets input, 314549803 bytes
 545400 packets output, 196787974 bytes
 11332 packets dropped
      1 minute input rate 703 pkts/sec,  840519 bytes/sec
      1 minute output rate 293 pkts/sec,  51317 bytes/sec
      1 minute drop rate, 3 pkts/sec
      5 minute input rate 192 pkts/sec,  65690 bytes/sec
      5 minute output rate 197 pkts/sec,  113053 bytes/sec
      5 minute drop rate, 3 pkts/sec
  Members in this channel:
      Active:   Gi0/2 Gi0/3

ASA5545-x/act# sh int vlan5
Interface Port-channel1.5 "vlan5", is up, line protocol is up
  Hardware is EtherChannel/LACP, BW 2000 Mbps, DLY 10 usec
 VLAN identifier 5
 Description: Email Servers
 MAC address a00c.0001.600f, MTU 1500
 IP address 192.168.110.4, subnet mask 255.255.255.0
  Traffic Statistics for "vlan5":
 61511 packets input, 66064278 bytes
 35265 packets output, 13693394 bytes
 40 packets dropped

Thanks for your commends in advance

[Sheraz.Salim]

my understanding is your vlan 1 and port-channel both will have a 1 gig throughput.

the reason for this is, your 1gig interface is a part of port-channel group and your vlan will inherit the same throughput as your interface capacity.

the reason you see BW 2000 Mbps is because you have a bundle of port-channel. In case one of the port-channel physical interface fail the other use be in use. having 2 interface in port-channel does not mean you will have a more throughput.

A common misconception with etherchannel is that it will increase bandwidth for single connections. It won't. So if you have a client talking to a server and it sends 1.5Gbps of traffic and you create a 2Gbps etherchannel this 1.5Gbps will not be spread across both links ie. the client to server traffic for that particular connection will still only use on of the physical 1Gbps links.

The purpose of using etherchannel is -

1) redundancy of links

2) for multiple connections you can indeed increase the bandwidth because different connections can spread across different physical links within the etherchannel.

Note that when referring to connections above a connection could be -

1) src/dst mac-address pair

2) src/dst IP address pair

3) src/dst L4 port (eg TCP or UDP port)

[Sheraz.Salim · Accepted solution]

 i remember correctly by default ASA in port channel work on the algorithm of scr-dest-ip. unless you want to change it.

in regards to VLAN 5 it also has the bandwidth of 1000 Mbps as it is also part of bundle in your port-channel on ASA gig0/2,gig0/3. that is why you see the BW 2000 Mbps.

whatever setting apply on port-channel1 in your case (e.g scr-dest-ip,multi src/dst etc) will inherit down to vlan 1 and vlan5.

please dont forget to rate.

[bensonlei]

No more question here