02-04-2008 10:59 AM - edited 03-03-2019 08:33 PM
I have 2 inputs for my internet link they are both the same speed. The config was setup for load balance and failover. I am upgrading one of the links to three times the speed and would like all traffic to use that link(Disable load Balance). And the other link for only failover. Any sugetions if this could be done or what changes need to be made in the config
ip subnet-zero
ip flow-cache timeout active 1
no ip domain lookup
ip audit notify log
ip audit po max-events 100
ip ssh time-out 60
no ftp-server write-enable
!
!
!
interface Multilink1
ip address 144.xxx.xxx.xxx 255.255.255.xxx
ip access-group 150 out
ip route-cache flow
ntp disable
no keepalive
fair-queue
no cdp enable
ppp multilink
ppp multilink group 1
!
interface FastEthernet0/0
description connected to Provider 1
bandwidth 100000
ip address 69.xxx.xxx.xxx 255.255.255.xxx
ip access-group 150 out
ip route-cache flow
duplex auto
speed auto
ntp disable
no cdp enable
no mop enabled
!
interface Serial0/0
description connected to Provider 2
bandwidth 1544
no ip address
max-reserved-bandwidth 100
encapsulation ppp
ip route-cache flow
no fair-queue
no cdp enable
ppp multilink
ppp multilink group 1
!
interface FastEthernet0/1
description connected to Firewall
bandwidth 100000
ip address 206.xxx.xxx.xxx 255.255.255.0
ip access-group 112 in
ip route-cache flow
duplex auto
speed auto
ntp disable
no cdp enable
no mop enabled
!
interface Serial0/1
description connected to Provider 2
bandwidth 1544
no ip address
max-reserved-bandwidth 100
encapsulation ppp
ip route-cache flow
no cdp enable
ppp multilink
ppp multilink group 1
!
router rip
version 2
network 206.0.0.0
no auto-summary
!
router bgp 333333
no synchronization
bgp log-neighbor-changes
network 206.xxx.xxx.0
neighbor 69.xxx.xxx.xxx remote-as 11111
neighbor 69.xxx.xxx.xxx ebgp-multihop 3
neighbor 69.xxx.xxx.xxx timers 10 30
neighbor 69.xxx.xxx.xxx password 7 xxxxxxxxxxx
neighbor 69.xxx.xxx.xxx filter-list 2 in
neighbor 69.xxx.xxx.xxx filter-list 3 out
neighbor 144.xxx.xxx.xxx remote-as 22222
neighbor 144.xxx.xxx.xxx timers 10 30
neighbor 144.xxx.xxx.xxx filter-list 1 in
neighbor 144.xxx.xxx.xxx filter-list 3 out
no auto-summary
!
no ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 Multilink1
ip route 69.xxx.xxx.xxx 255.255.255.255 69.xxx.xxx.xxx
!
ip as-path access-list 1 permit ^1239_[0-9]*$
ip as-path access-list 2 permit ^32654_[0-9]*$
ip as-path access-list 3 permit ^$
!
ip any any log
no cdp run
02-06-2008 09:39 PM
The simplest way to have all the traffic go via only 1 link is to give a higher weight for that particular neighbor.
neighbor x.x.x.x weight
Since weight is the attribute that bgp refers 1st, the routes with higher weight will be preferred. Thanks!
Best Regards,
Manoj
02-08-2008 01:28 PM
Add the weight to both providers and removed
default routes. Looks like it's working.
Thanks
02-06-2008 10:29 PM
Hi,
There are filter-lists for incoming routing updates for both the neighbors, hence assuming that, for those filterd n/ws, the traffic will go out on that provider's link.
For the rest of the o/g traffic, there is a default route to Mu1, config another one with higher AD (floating static) pointing to other provider.. This will work as fail over for o/g traffic.
For incoming traffic, u can take help of AS path attribute to advt ur n/w to both the providers with diff length of AS-path, this will make i/c traffic come from ur desired provider..and also provide failover thro' the other provider as backup path.
Rgds,
Dhiren Shah
02-08-2008 08:58 PM
HI, [PLS RATE if HELPS]
Add weight attribute to the Primary Link and it should be preferred always.
For the failover, use the floating static routes. Add more AD value to the secondary Link, so whenever the Primary fails the Secondary is always there in the Global Routing table with Higher AD is preferred.
When the Primary is restored, the BGP with more Weight value is trigerred in the Routing table, Since the AD of BGP will be "20" and the fall-back to primary will occur.
PLS RATE if HELPS
Best Regards,
Guru Prasad R
02-12-2008 01:35 PM
Add the weight to both AS neighbor,now all out put is going out Fastethernet 0/0 and all input is comming multillink1.Is only one provider sending updates, or is there somthing I am missing. her is the show ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 0.0.0.0 69.x.x.x 0 200 11111 i
*> 8.3.52.0/23 144.x.x.x 561 20 22222 26759 i
*> 8.3.213.0/24 144.x.x.x 561 20 22222 4739 i
*> 8.8.9.0/24 144.x.x.x 561 20 22222 27646 ?
*> 8.8.128.0/21 144.x.x.x 245 20 22222 14135 i
*> 8.10.162.0/24 144.x.x.x 561 20 22222 19181 i
*> 8.11.251.0/24 144.x.x.x 210 20 22222 14236 i
*> 8.12.72.0/22 144.x.x.x 170 20 22222 13767 i
*> 12.0.18.0/24 144.x.x.x 210 20 22222 27585 i
*> 12.0.239.0/24 144.x.x.x 229 20 22222 33628 i
*> 12.2.46.0/24 144.x.x.x 193 20 22222 22492 i
*> 12.2.142.0/24 144.x.x.x 8 20 22222 14381 i
*> 12.3.33.0/24 144.x.x.x 230 20 22222 17033 i
*> 12.4.96.0/24 144.x.x.x 210 20 22222 14452 i
*> 12.4.96.0/23 144.x.x.x 210 20 22222 14452 i
*> 12.4.97.0/24 144.x.x.x 210 20 22222 14452 i
*> 12.5.96.0/24 144.x.x.x 171 20 22222 6988 i
*> 12.9.194.0/23 144.x.x.x 560 20 22222 32012 i
*> 12.9.196.0/22 144.x.x.x 560 20 22222 32012 i
*> 12.14.172.0/23 144.x.x.x 171 20 22222 29960 i
02-12-2008 10:37 PM
Hi,
One Question Here: what is the objective of configuring a default route here? you router will always prefer the Default route over the BGP, since you are running BGP, you dont need a default route
You could just configure the (Weight) or (local prefrence) to influence your outgoing path.
As for the incoming traffic, Since you have different Service providers, you would configure As-Path prepending so that incoming traffic will prefer your desired SP.
HTH
Mohamed
02-13-2008 08:54 PM
Hi,
The default route will be in action for the networks not learned from the bgp peers, it will not override the bgp learned prefixes. If the bgp peers are sending default route in bgp(which may not be the case here), then static default route is not reqd.
Rgds,
Dhiren
02-13-2008 12:31 PM
For this set-up, couldn't you use static routes to do the same thing?
ip route 0.0.0.0 0.0.0.0
ip route 0.0.0.0 0.0.0.0
This way the routes are tied to the interface, if the interface goes down on the primary link all routes will go out the secondary link. When thr primary comes back up it will assume primary role. This might provide faster convergence for you too.
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