11-20-2007 07:03 AM - edited 03-03-2019 07:36 PM
Hai all,
My customer is facing a issue in load balancing OSPF in Multilink (Point to Point ) after configuring the multilink customer is only able to use 60 % of the bandwidth.
Now customer has removed the multilink but still he is not able to load balance ..
Customer requirement OSPF load balancing has to be optimized. Right now per-packet CEF is being used. But full bandwidth is not getting utilized.
belw is the customer config
nterface Loopback0
ip address 192.168.254.11 255.255.255.255
!
interface GigabitEthernet0/0
ip address 172.18.0.14 255.255.240.0
duplex auto
speed auto
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
no ip address
clock rate 2000000
interface Serial0/0/1
description IPLC 2nd Link - 0440031962
bandwidth 2048
ip address 172.18.207.6 255.255.255.252
ip load-sharing per-packet
no ip mroute-cache
ip ospf network point-to-point
load-interval 30
no fair-queue
hold-queue 500 out
!
interface Serial0/1/0
no ip address
no ip mroute-cache
shutdown
clock rate 2000000
!
interface Serial0/1/1
description IPLC 4th Link - 0440090531
bandwidth 2048
ip address 172.18.207.14 255.255.255.252
ip load-sharing per-packet
no ip mroute-cache
ip ospf network point-to-point
load-interval 30
no fair-queue
hold-queue 500 out
!
interface Serial0/2/0
description IPLC 3rd Link - 0440044832
bandwidth 2048
ip address 172.18.207.10 255.255.255.252
ip load-sharing per-packet
no ip mroute-cache
ip ospf network point-to-point
load-interval 30
no fair-queue
hold-queue 500 out
!
interface Serial0/2/1
description IPLC 1st Link - 0220009129
bandwidth 2048
ip address 172.18.207.2 255.255.255.252
ip load-sharing per-packet
no ip mroute-cache
ip ospf network point-to-point
load-interval 30
no fair-queue
hold-queue 500 out
!
router ospf 1
router-id 192.168.254.11
log-adjacency-changes
redistribute static subnets
network 172.18.0.0 0.0.15.255 area 0
network 172.18.207.0 0.0.0.3 area 0
network 172.18.207.4 0.0.0.3 area 0
network 172.18.207.12 0.0.0.3 area 0
network 192.168.254.11 0.0.0.0 area 0
!
ip classless
ip route 10.16.19.0 255.255.255.0 172.18.207.1
ip route 10.16.19.0 255.255.255.0 172.18.207.5
ip route 10.16.19.0 255.255.255.0 172.18.207.9
ip route 10.16.19.0 255.255.255.0 172.18.207.13
ip route 172.16.0.0 255.255.0.0 172.18.0.2 250
ip route 172.17.0.0 255.255.0.0 172.18.0.2 250
ip route 172.18.16.0 255.255.240.0 172.18.0.1
ip route 172.18.32.0 255.255.240.0 172.18.0.1
ip route 172.18.160.0 255.255.240.0 172.18.0.1
ip route 172.20.0.0 255.255.0.0 172.18.0.1
ip route 192.168.100.57 255.255.255.255 172.18.207.1
ip route 192.168.100.57 255.255.255.255 172.18.207.5
ip route 192.168.100.57 255.255.255.255 172.18.207.9
ip route 192.168.100.57 255.255.255.255 172.18.207.12
Lijesh.N.C
11-20-2007 07:28 AM
Could you post the configuration with the PPP multilink in place please? Also, the other side of these links?
If you are doing PPP multilink, the discussion about per-packet or per-destination does not enter into it. The PPP treats both links as a single connection, and load-balances the links very effectively. In that case, you only have one IP address at each end, which goes on the multilink interface.
Kevin Dorrell
Luxembourg
11-26-2007 05:14 AM
hai Kev,'
Sorry for the delayed reply...
I am attaching the multilink configuration which we tried and failed (only one multilink is coming up at a time, out of two). Please go through it and suggest any changes would be required.
Also we tried for per-destination CEF, but it was working fine, till we noticed that certain links are getting highly utilized at times(due to certain high bandwidth consuming application servers-hosts pairs are getting mapped to those interfaces ) and hence we went for per-packet CEF. Its working fine, still utilization is not optimized fully.(only 20-30%) of the bandwidth of each link is getting utilized).
We use a Cisco 2811 router with IOS version of 12.4(3f), and it supports fast switching functionality needed for per-destination CEF.
Multilink config
interface Multilink1
desc XXXXXXXX
ip address 172.18.207.1 255.255.255.252
no cdp enable
ppp multilink
ppp multilink fragment disable
ppp multilink group 1
interface Serial0/0/0
desc XXXXXXXX
bandwidth 2048
no ip address
encapsulation ppp
no cdp enable
ppp multilink
ppp multilink group 1
interface Serial0/2/0
desc XXXXXXXX
bandwidth 2048
no ip address
encapsulation ppp
no cdp enable
ppp multilink
ppp multilink group 1
interface Multilink2
desc *** MLPPP Bundle2
ip address 172.18.207.5 255.255.255.252
no cdp enable
ppp multilink
ppp multilink fragment disable
ppp multilink group 2
interface Serial0/0/1
desc XXXXXXXX
no ip address
encapsulation ppp
no cdp enable
ppp multilink
ppp multilink group 2
interface Serial0/2/1
desc XXXXXXXX
no ip address
encapsulation ppp
no cdp enable
ppp multilink
ppp multilink group 2
------------------------
existing config
!
interface Serial0/1/0
no ip address
no ip mroute-cache
shutdown
clock rate 2000000
!
interface Serial0/1/1
descriptionXXXXXXXX
bandwidth 2048
ip address 172.18.207.14 255.255.255.252
ip load-sharing per-packet
no ip mroute-cache
ip ospf network point-to-point
load-interval 30
no fair-queue
hold-queue 500 out
!
interface Serial0/2/0
description IPLC 3rd Link - 0440044832
bandwidth 2048
ip address XXXXXXXX
ip load-sharing per-packet
no ip mroute-cache
ip ospf network point-to-point
load-interval 30
no fair-queue
hold-queue 500 out
!
interface Serial0/2/1
descriptionXXXXXXXX
bandwidth 2048
ip address 172.18.207.2 255.255.255.252
ip load-sharing per-packet
no ip mroute-cache
ip ospf network point-to-point
load-interval 30
no fair-queue
hold-queue 500 out
!
router ospf 1
router-id 192.168.254.11
log-adjacency-changes
redistribute static subnets
network 172.18.0.0 0.0.15.255 area 0
network 172.18.207.0 0.0.0.3 area 0
network 172.18.207.4 0.0.0.3 area 0
network 172.18.207.8 0.0.0.3 area 0
network 172.18.207.12 0.0.0.3 area 0
network 192.168.254.11 0.0.0.0 area 0
!
ip classless
ip route 10.16.19.0 255.255.255.0 172.18.207.1
ip route 10.16.19.0 255.255.255.0 172.18.207.5
ip route 10.16.19.0 255.255.255.0 172.18.207.9
ip route 10.16.19.0 255.255.255.0 172.18.207.13
ip route 172.16.0.0 255.255.0.0 172.18.0.2 250
ip route 172.17.0.0 255.255.0.0 172.18.0.2 250
ip route 172.18.16.0 255.255.240.0 172.18.0.1
ip route 172.18.32.0 255.255.240.0 172.18.0.1
ip route 172.18.160.0 255.255.240.0 172.18.0.1
ip route 172.20.0.0 255.255.0.0 172.18.0.1
ip route 192.168.100.57 255.255.255.255 172.18.207.1
ip route 192.168.100.57 255.255.255.255 172.18.207.5
ip route 192.168.100.57 255.255.255.255 172.18.207.9
ip route 192.168.100.57 255.255.255.255 172.18.207.12
11-26-2007 06:19 AM
Hi ,
please share the output of commands:-
show ip ospf database.
show ip ospf neighbours
show ip ospf interfaces
show ip route.
11-26-2007 07:29 AM
hai sir,
Will do that ..nice to hear that u ve moved to BSG ...right place 4 u
Lijesh .N.C
csg blr
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