From: Luan Nguyen (luan.m.nguyen@gmail.com)
Date: Sun Jul 06 2008 - 02:04:47 ART
Joe,
After researching, that is the correct behavior. BGP local-rib is used to
export routes. The routing table is the forward information base, which
routes are installed using best-path algorithm.
Routing Protocols----->Import Policies--->Route Information Base
(RIB)--->export policies---->routing protocols
|
Route
Selection
Forwarding
Information Base (FIB)
For example, when you have a rib-failure that means the FIB has a better
route then the route come from BGP local-rib.
-Luan
On Sat, Jul 5, 2008 at 7:41 PM, Joseph Brunner <joe@affirmedsystems.com>
wrote:
> no its dynamips... ;)
>
> I was wondering if this was a code issue or some secret squirrel feature
> I'm
> not aware of... redistributing ALL BGP table stuff into eigrp with the
> "redistribute bgp" under router eigrp 10. We wouldn't want to miss anything
> right?
>
> Lower admin than eigrp, huh? let me try... with AD 54 static routes to
> null0
> as you suggested...
>
> very nice, Luan! seems to have went away, but does explain my original
> issue... ;( why do routes slip from the BGP table, not the routing table
> into EIGRP...
>
>
> NYCORPHQ1#show ip bgp
> BGP table version is 8, local router ID is 10.74.74.11
> 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
> *> 0.0.0.0 66.66.1.1 0 0 11401 i
> *> 66.55.5.0/25 0.0.0.0 0 32768 i
> *> 66.55.5.128/25 0.0.0.0 0 32768 i
>
> NYCORPHQ2#show ip bgp
> BGP table version is 4, local router ID is 10.74.74.12
> 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
> *> 0.0.0.0 66.66.2.1 0 0 11401 i
> *> 66.55.5.0/25 0.0.0.0 0 32768 i
> *> 66.55.5.128/25 0.0.0.0 0 32768 i
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Luan
> Nguyen
> Sent: Saturday, July 05, 2008 7:18 PM
> To: Joseph Brunner
> Cc: Cisco certification
> Subject: Re: Interesting BGP/EIGRP interaction
>
> I assume you can't do debug stuffs since it's production routers?
> I could put this in my lab later tonight and look...it seems very
> interesting.
> But in the mean time, while not route to null0 at a lower admin than EIGRP
> and see what happen? who cares if it's 254 or 54 right?
>
> -Luan
>
>
> On Sat, Jul 5, 2008 at 6:20 PM, Joseph Brunner <joe@affirmedsystems.com>
> wrote:
>
> > Good afternoon,
> >
> >
> >
> > Perhaps someone can shed some light on this strange, vexing issue.
> >
> >
> >
> > Normally we are lead to believe that the "redistribute" command
> > redistributes routes that are in the routing table using the protocol
> > referenced by the redistribute command. However I have a situation where
> > I'm
> > running EBGP between two edge routers and the isp routers. These router
> DO
> > NOT run IBGP between them. They DO run EIGRP between them. Eigrp is
> > configured to redistribute bgp learned routes, so that the default route
> > learned from the isp and redistributed to EIGRP learned internally.
> >
> >
> >
> > However the following is happening;
> >
> >
> >
> > 1. Eigrp is automatically redistributing the bgp holddown routes
> > static
> > to null0 (used to keep the routes in the bgp table permanently). Each
> Edge
> > router is configured with identical static routes to null for the
> netblocks
> > advertised into bgp.
> > 2. The edge router with the the superior metric configured for the
> > bgp-> eigrp redistribute command is becoming the router advertising these
> > static routes into eigrp as external routes. So while eigrp is only
> > configured with "redistribute bgp" they are indeed redistributing static
> > routes (the hold down routes to null0), as IF THE "REDISTRIBUTE STATIC"
> > command had been configured under router eigrp.
> > 3. This is causing the "show ip bgp" output on the egde router
> picking
> > up the eigrp static routes to list the other router's eigrp neighbor
> > address
> > as the "next hop" while is should be 0.0.0.0 (originated on this
> router).
> > The EDGE router with the inferior metric in the "redistribute bgp"
> command
> > under router eigrp see's this.
> > 4. How is this possible?????!?!?! Why is "redistribute bgp 65000"
> > under
> > router eigrp matching the bgp table, not the routes know via bgp!
> >
> >
> >
> > Please check the below.
> >
> >
> >
> > NYCORPHQ1#show ip bgp
> >
> > BGP table version is 4, local router ID is 10.74.74.11
> >
> > 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
> >
> > *> 0.0.0.0 66.66.1.1 0 0 11401 i
> >
> > *> 66.55.5.0/25 0.0.0.0 0 32768 i
> >
> > *> 66.55.5.128/25 0.0.0.0 0 32768 i
> >
> >
> >
> > NYCORPHQ1#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 66.66.1.1 to network 0.0.0.0
> >
> >
> >
> > 66.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
> >
> > C 66.66.1.0/30 is directly connected, Serial0/0
> >
> > S 66.55.5.0/25 is directly connected, Null0
> >
> > S 66.55.5.128/25 is directly connected, Null0
> >
> > C 192.168.5.0/24 is directly connected, FastEthernet0/1
> >
> > 10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
> >
> > C 10.74.74.11/32 is directly connected, Loopback1
> >
> > D 10.74.74.12/32 [90/156160] via 10.10.10.2, 00:07:03,
> > FastEthernet1/0
> >
> > C 10.10.10.0/24 is directly connected, FastEthernet1/0
> >
> > C 10.1.1.0/30 is directly connected, FastEthernet0/0
> >
> > D 10.74.74.1/32 [90/409600] via 10.1.1.2, 00:07:03,
> FastEthernet0/0
> >
> > D 10.1.1.4/30 [90/284160] via 10.10.10.2, 00:07:04,
> FastEthernet1/0
> >
> > D 10.254.0.0/24 [90/284160] via 10.1.1.2, 00:07:04,
> FastEthernet0/0
> >
> > B* 0.0.0.0/0 [20/0] via 66.66.1.1, 00:08:51
> >
> >
> >
> >
> >
> > NYCORPHQ2#show ip bgp
> >
> > BGP table version is 4, local router ID is 10.74.74.12
> >
> > 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
> >
> > *> 0.0.0.0 66.66.2.1 0 0 11401 i
> >
> > *> 66.55.5.0/25 10.10.10.1 307200 32768 i
> >
> > *> 66.55.5.128/25 10.10.10.1 307200 32768 i
> >
> >
> >
> > NYCORPHQ2#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 66.66.2.1 to network 0.0.0.0
> >
> >
> >
> > 66.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
> >
> > C 66.66.2.0/30 is directly connected, Serial1/0
> >
> > D EX 66.55.5.0/25 [170/307200] via 10.10.10.1, 00:06:35, Ethernet0/1
> >
> > D EX 66.55.5.128/25 [170/307200] via 10.10.10.1, 00:06:35,
> Ethernet0/1
> >
> > 10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
> >
> > D 10.74.74.11/32 [90/409600] via 10.10.10.1, 00:06:35, Ethernet0/1
> >
> > C 10.74.74.12/32 is directly connected, Loopback1
> >
> > C 10.10.10.0/24 is directly connected, Ethernet0/1
> >
> > D 10.1.1.0/30 [90/307200] via 10.10.10.1, 00:06:35, Ethernet0/1
> >
> > [90/307200] via 10.1.1.6, 00:06:35, Ethernet0/0
> >
> > D 10.74.74.1/32 [90/409600] via 10.1.1.6, 00:06:35, Ethernet0/0
> >
> > C 10.1.1.4/30 is directly connected, Ethernet0/0
> >
> > D 10.254.0.0/24 [90/284160] via 10.1.1.6, 00:06:35, Ethernet0/0
> >
> > B* 0.0.0.0/0 [20/0] via 66.66.2.1, 00:07:41
> >
> >
> >
> >
> >
> > NYCORPHQ1#show run
> >
> > interface FastEthernet0/0
> >
> > ip address 10.1.1.1 255.255.255.252
> >
> > duplex auto
> >
> > speed auto
> >
> > !
> >
> > interface Serial0/0
> >
> > ip address 66.66.1.2 255.255.255.252
> >
> > ip virtual-reassembly
> >
> > clock rate 2000000
> >
> > !
> >
> > interface FastEthernet1/0
> >
> > ip address 10.10.10.1 255.255.255.0
> >
> > ip virtual-reassembly
> >
> > speed 10
> >
> > full-duplex
> >
> > !
> >
> > router eigrp 10
> >
> > redistribute bgp 65000 metric 10000 100 255 1 1500
> >
> > network 10.0.0.0
> >
> > no auto-summary
> >
> > !
> >
> > router bgp 65000
> >
> > no synchronization
> >
> > bgp log-neighbor-changes
> >
> > network 66.55.5.0 mask 255.255.255.128
> >
> > network 66.55.5.128 mask 255.255.255.128
> >
> > neighbor 66.66.1.1 remote-as 11401
> >
> > neighbor 66.66.1.1 route-map nycorphq1 out
> >
> > no auto-summary
> >
> > !
> >
> > ip forward-protocol nd
> >
> > ip route 66.55.5.0 255.255.255.128 Null0 254
> >
> > ip route 66.55.5.128 255.255.255.128 Null0 254
> >
> > !
> >
> > !
> >
> > no ip http server
> >
> > no ip http secure-server
> >
> > !
> >
> > !
> >
> > ip prefix-list 66.55.5.0-25 seq 5 permit 66.55.5.0/25
> >
> > !
> >
> > ip prefix-list 66.55.5.128-25 seq 5 permit 66.55.5.128/25
> >
> > !
> >
> > route-map nycorphq1 permit 10
> >
> > match ip address prefix-list 66.55.5.0-25
> >
> > set metric 50
> >
> > !
> >
> > route-map nycorphq1 permit 20
> >
> > match ip address prefix-list 66.55.5.128-25
> >
> > set metric 500
> >
> > !
> >
> > !
> >
> > !
> >
> > !
> >
> > control-plane
> >
> > !
> >
> >
> >
> > NYCORPHQ2#show run
> >
> >
> >
> > !
> >
> > interface Ethernet0/0
> >
> > ip address 10.1.1.5 255.255.255.252
> >
> > half-duplex
> >
> > !
> >
> > interface Ethernet0/1
> >
> > ip address 10.10.10.2 255.255.255.0
> >
> > ip virtual-reassembly
> >
> > full-duplex
> >
> > !
> >
> > interface Ethernet0/2
> >
> > no ip address
> >
> > shutdown
> >
> > half-duplex
> >
> > !
> >
> > interface Ethernet0/3
> >
> > no ip address
> >
> > shutdown
> >
> > half-duplex
> >
> > !
> >
> > interface Serial1/0
> >
> > ip address 66.66.2.2 255.255.255.252
> >
> > ip virtual-reassembly
> >
> > serial restart-delay 0
> >
> > clock rate 2016000
> >
> > !
> >
> > interface Serial1/1
> >
> > no ip address
> >
> > shutdown
> >
> > serial restart-delay 0
> >
> > !
> >
> > interface Serial1/2
> >
> > no ip address
> >
> > shutdown
> >
> > serial restart-delay 0
> >
> > !
> >
> > interface Serial1/3
> >
> > no ip address
> >
> > shutdown
> >
> > serial restart-delay 0
> >
> > !
> >
> > router eigrp 10
> >
> > redistribute bgp 65000 metric 1500 100 255 1 1500
> >
> > network 10.0.0.0
> >
> > no auto-summary
> >
> > !
> >
> > router bgp 65000
> >
> > no synchronization
> >
> > bgp log-neighbor-changes
> >
> > network 66.55.5.0 mask 255.255.255.128
> >
> > network 66.55.5.128 mask 255.255.255.128
> >
> > neighbor 66.66.2.1 remote-as 11401
> >
> > neighbor 66.66.2.1 route-map nycorphq2 out
> >
> > no auto-summary
> >
> > !
> >
> > no ip http server
> >
> > no ip http secure-server
> >
> > !
> >
> > ip forward-protocol nd
> >
> > ip route 66.55.5.0 255.255.255.128 Null0 254
> >
> > ip route 66.55.5.128 255.255.255.128 Null0 254
> >
> > !
> >
> > !
> >
> > !
> >
> > ip prefix-list 66.55.5.0-25 seq 5 permit 66.55.5.0/25
> >
> > !
> >
> > ip prefix-list 66.55.5.128-25 seq 5 permit 66.55.5.128/25
> >
> > !
> >
> > route-map nycorphq2 permit 10
> >
> > match ip address prefix-list 66.55.5.128-25
> >
> > set metric 50
> >
> > !
> >
> > route-map nycorphq2 permit 20
> >
> > match ip address prefix-list 66.55.5.0-25
> >
> > set metric 500
> >
> > !
> >
> > !
> >
> > !
> >
> > control-plane
> >
> > !
> >
> > !
> >
> > !
> >
> > !
> >
> >
> > _______________________________________________________________________
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