IBGP Route Path Defining to EBGP

Hi All,
I have a two different ISP s configured BGP with Core Router. I have to set path for some ibgp sessons goes through isp1 and remainig ibgp sessions goes through isp2 and If one isp down means another isp have to take over all ibgp sessions.
I tried Next-hop and As path but not working properly.
How to achieve this..?
Please help me to Solve this.
PFA for Scenario.
Thanks...,
Prakalathan.

Hi Marshall,
Thanks to relpy.
I'm trying to achieve both incoming and outgoing traffic of client 1 &2 through ISP1 and Client 3&4 through ISP2 .
If ISP1 fails, ISP2 take care all clients in network.
IBGP sessions among core and client routers and EBGP between Core and ISP1, ISP2.
Thanks.,
Prakalathan.K

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You can use EEM for this. Check out the cisco beyond web site for sample scripts that may help you do this.
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How is the administrative distance positioned in the bgp route decision ?
i.e If a route is learned from iBGP with higher "local prefernece" and eBGP with lower "local prefernece" - which path will be installed in the routing table
the path learned from eBGP or the path with higer local prefernce ?

For your scenario the path with the higher local pref will be installed in the routing table althogh its ibgp.
if a router recieves the same prefix from 2 neighbors 1 from ibgp and the other from ebgp
the router will compare them with the bgp path selection algorithm
the one that wins will be installed in the routing table with the admin distance of the kind of route it is so if the ibgp route won the path selection you will see in the routing table the admin distance of 200,if the ebgp route won you'll see 20 in the admin distance.
so remember the ibgp/ebgp comparision is the 9th in the path selection algorithm so an ibgp route can win the path selection by (local pref weight....)
and if the ibgp won then you'll see the ibgp admin dstance in your routing tables.

Routing scenario.

We have configured EIGRP on Location C and redistributing into BGP in Location C peer routers. Also, we are running IBGP between R1 & R2.
Running EBGP between R1 (Location C) and R3 (Location A) & R4 (Location C) and R2 (Location B).
Between Location A, Location D and Location B we have MPLS cloud, where we are running BGP.
Now, we are facing problem that users in Location C needs to access server farm located in Location A & Location D, where primary path should be
Between Location C- Location A (R1 - R 3) and secondary path is Location C - Location B (R2 - R4).
But while doing the configuration, we are facing issue while advertising the routes in MPLS cloud, as we running BGP and redistributing the static routes.
Now, question is on which MPLS router we shall add the static route pointing to L3 switch for Location C subnet.
Or if there is any other solution we can apply for this scenario to work.
Thanks in Advance to all people for advising.

In your scenario, I would install a 4-port HWIC Ethernet card into both WAN routers then have your WAAS box plugged into them. One interface configured as the primary and the second one configured for standby. You would need to have an Ethernet cable plugged between the 2 WAN routers for transit traffic. Configure L2/forward and GRE for the return traffic and use WCCP negotiate return for the egress method. This is how all of our remote sites are setup. A second method is if you don't want to plug directly into the WAN routers, you can replace your l3 (model ?) switches with a stack of 3750Es and make them look like one logical switch.

Modifying iBGP distance for a Specific Prefix

Hi
I have scenario where I wish bgp backdoor could be used, but it can't in this case.
I have router learning a single prefix via EIGRP and iBGP. I would like it to prefer iBGP, but of course EIGRP wins due to distance (90).
I would like to modify a single prefix learned via iBGP to say 80 for example. So long as it wins over EIGRP.
I've researched few posts, but they point to eBGP. I would imagine the same could be acheived for iBGP. Has anyone done this and is there any other ways it can be acheived other than using ACL with distance command under BGP.
thank you

You may change the EIGRP AD for the specific prefix, as Julio outlines, it is probably best doing it this way than to play with BGP.
The way you can accomplish that is here:
R1 is advertising a connected network 1.1.1.0. There is an iBGP peering between R1 and R2. Also an EIGRP neighborship between them both. I want to influence R2's route to 1.1.1.0/24 to prefer iBGP (200) over eigrp (90).
Here is my current config and routes.
router eigrp 10
network 1.1.1.0 0.0.0.255
network 10.0.0.1 0.0.0.0
no auto-summary
router bgp 100
no synchronization
bgp router-id 10.0.0.1
bgp log-neighbor-changes
network 1.1.1.0 mask 255.255.255.0
neighbor 10.0.0.2 remote-as 100
no auto-summary
Rack1R2
router eigrp 10
network 10.0.0.2 0.0.0.0
no auto-summary
router bgp 100
no synchronization
bgp router-id 10.0.0.2
bgp log-neighbor-changes
neighbor 10.0.0.1 remote-as 100
no auto-summary
Rack1R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/409600] via 10.0.0.1, 00:06:30, FastEthernet0/0
10.0.0.0/30 is subnetted, 1 subnets
C 10.0.0.0 is directly connected, FastEthernet0/0
Rack1R2#
Rack1R2#show ip bgp
BGP table version is 4, local router ID is 10.0.0.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
r>i1.1.1.0/24 10.0.0.1 0 100 0 i
Rack1R2#
Now to modify the AD for the particular prefix in EIGRP.
Rack1R2(config)#router eigrp 10
Rack1R2(config-router)#distance ?
<1-255> Administrative distance
eigrp IP-EIGRP distance
Rack1R2(config-router)#distance 201 ? -Make it worse that iBGP
A.B.C.D IP Source address
Rack1R2(config-router)#distance 201 10.0.0.1 ? - Where you are learning the route from
A.B.C.D Wildcard bits
Rack1R2(config-router)#distance 201 10.0.0.1 0.0.0.0 1 - Followed by an ACL to match the prefix
Rack1R2(config)#ip access-list standard 1
Rack1R2(config-std-nacl)#permit 1.1.1.0
Rack1R2(config-std-nacl)#exit
Rack1R2(config)#
For me, it took effect immediately, but you may need to clear ip route x.x.x.x (i've experienced this before)
Rack1R2(config)#do show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
B 1.1.1.0 [200/0] via 10.0.0.1, 00:03:28
10.0.0.0/30 is subnetted, 1 subnets
C 10.0.0.0 is directly connected, FastEthernet0/0
Now it has changed to prefer the iBGP route. Please take extra caution as doing this even with IGPs generally can cause routing loops.
hth.

SoO and eBGP

SoO is used to prevent a route from being readvertised back to the site from which it originated...
but in following case when eBGP is the PE/CE routing protocol, PE3 will prefer the eBGP route from CE-2 instead of iBGP route from PE1 or PE2 unless routing loop is intentionally created by preferring the iBGP route through weight or other attributes....
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Hi,
SoO is required with BGP when you also configured as-override. In this case the AS PATH can't be used anymore to detect loop so you need something else to identify from where this path is coming from.
In usual case, PE3 will send the update to CE2 which will drop it as it sees its own AS in the AS-PATH. With as-override, CE2 is not seeing its own AS anymore.
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Dear SAP EXPERTS !
1. The route is not been able to be determined in the sytem for the Order.
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Without Weight group: Transporation zone and weight group in CMR & MMR.
Also assigned shipping point with Trp. Zone.
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In the Shipment Documents Creation: VT01n
I am unable to find the deliveries Craeted.
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regards,
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I am unable to find the deliveries Craeted.
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I hope this will help you,
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I need to create new route with the following parameters.
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Route description: Kiev Express
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Under the Same Menu path---Maintain Stages for all Routes.
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11.Maintain County and Transportation Zone for Shipping Point.
Under the Same Menu path--- Maintain County and Transportation Zone for Shipping Point. Select the Shipping point and enter the Country and Transportation Zone
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Under the Same Menu path--Maintain Route Determination. Select New Entries and Define the Route Determination.
SHIPMENTS
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IMGLogistics Execution-Transportation-Basic Transportation Function-ShipmentsDefine Shipment Types. Select the New Entries and define Shipment Type
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Hope it helps
thanks

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