10-26-2006 02:03 AM - edited 03-03-2019 02:28 PM
Dear all,
My company WAN connected is using Metro Ethernet 3M for each subinterface.
I want to clarify four points,
1. Fa1/1 using speed 100. is it correct?
2. Fa1/1.2701 & Fa1/1.2717 using "bandwidth 3072". is it correct?
3. Fa1/1.2701 & Fa1/1.2717 using "ip bandwidth-percent eigrp 1 100". is it correct?
4. sh int FastEthernet1/1.2717, this command seems can't reflect the traffic speed.
===============================================================
router#sh run
!
interface FastEthernet1/1
description HK 3MB Metro Ethernet VP123456
no ip address
speed 100
full-duplex
priority-group 1
!
interface FastEthernet1/1.2701
description HK - TPA 3MB MetroEthernet VLAN ID 2701
bandwidth 3072
encapsulation dot1Q 2701
ip address 10.11.11.254 255.255.255.0
ip bandwidth-percent eigrp 1 100
!
interface FastEthernet1/1.2717
description HK - LKI 3MB MetroEthernet VLAN ID 2717
bandwidth 3072
encapsulation dot1Q 2717
ip address 10.22.22.254 255.255.255.0
ip accounting output-packets
ip bandwidth-percent eigrp 1 100
!
router eigrp 1
redistribute static
network 10.0.0.0
no auto-summary
!
router#
===============================================================
router#sh int FastEthernet1/1.2717
FastEthernet1/1.2717 is up, line protocol is up
Hardware is AmdFE, address is 0011.5c06.dfa2 (bia 0011.5c06.dfa2)
Description: HK - LKI 3MB MetroEthernet VLAN ID 2717
Internet address is 10.22.22.254/24
MTU 1500 bytes, BW 3072 Kbit, DLY 100 usec,
reliability 255/255, txload 7/255, rxload 4/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 2717.
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters never
router#
===============================================================
Regards,
Samuel
10-26-2006 02:40 AM
Hi, in answer to your questions.
1. 100 mb is the speed of the physical interface. This is correct.
2. 3072 is the correct bandwidth of a 3mb link (3* 1024) which is also correct. This will be used by routing protocols for calculating costs over links. You may also want to consider policing or shaping over the subinterfaces (but without seeing the whole network and understaig the Metro service I would do a little investigating first).
3. This command allows eigrp to use upto 100% of the bandwidth for routing protocol traffic. The default is normally 50% (see the lionk for configuration guidelines).
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094063.shtml
4.The show command does reflect the traffic speed (see below). It's calculated as traffic/255 where 255 is 100%.
txload 7/255, rxload 4/255
10-26-2006 05:13 AM
hi Mark,
in point 4.
I test to copy a folder which has 800 MB size from one side to another side, the traffic only has txload 7/255, rxload 4/255. It seems not reflect the real traffic. what's happen?
Thanks!
Samuel
10-28-2006 03:37 PM
is there anyone can help?
thanks!
Samuel
10-30-2006 01:55 PM
The txload and rxload are 5 minute averages, so unless the link is pretty full for 5 minutes, it won't be immediately reflected.
05-23-2008 06:13 AM
This can be changed on a per-interface basis using the 'load-interval' command.
The lowest you can go is 30 seconds:
load-interval 30
Hope this helps.
Ron B
05-28-2008 01:42 AM
I was under the impression that the bandwidth command did not actually change the interface speed, but merely worked on an informational level. For example TCP would use that information and throttle down accordingly, but the actual interface bandwidth is still 100 mbit since speed is set to 100 on the main interface. IGP's should also use it to calculate metrics.
If the line speed is indeed 3mbit there has to be some sort of traffic-shaping or policing in place, perhaps at the provider's edge
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