Hi Guys,
These are the output of :
IGP (RIPv2 for connecting BGP links) :
R4#sr | s router rip
router rip
version 2
network 10.0.0.0
no auto-summary
R4#
show ip bgp :
R4#sib
BGP table version is 8, local router ID is 4.4.4.4
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
*> 1.0.0.0 10.1.14.1 0 400 0 100 i
*>i2.0.0.0 10.1.23.2 0 100 0 i
*>i3.0.0.0 10.1.34.3 0 100 0 i
*> 4.0.0.0 0.0.0.0 0 32768 i
* 11.0.0.0 10.1.14.1 0 0 100 i
*>i 10.1.12.1 0 400 0 100 i
R4#
show ip route 11.1.1.1 & longer :
R4#sir 11.1.1.1
Routing entry for 11.0.0.0/8
Known via "bgp 200", distance 200, metric 0
Tag 100, type internal
Last update from 10.1.12.1 00:07:16 ago
Routing Descriptor Blocks:
* 10.1.12.1, from 10.1.23.2, 00:07:16 ago
Route metric is 0, traffic share count is 1
AS Hops 1
Route tag 100
MPLS label: none
R4#sir 11.1.1.1 longer
Codes: L - local, 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, + - replicated route
Gateway of last resort is not set
B 11.0.0.0/8 [200/0] via 10.1.12.1, 00:07:32
R4#
show ip cef :
R4#sh ip cef
Prefix Next Hop Interface
0.0.0.0/0 no route
0.0.0.0/8 drop
0.0.0.0/32 receive
1.0.0.0/8 10.1.14.1 Ethernet0/0
2.0.0.0/8 10.1.34.3 Serial1/0.43
3.0.0.0/8 10.1.34.3 Serial1/0.43
4.0.0.0/8 attached Loopback0
4.0.0.0/32 receive Loopback0
4.4.4.4/32 receive Loopback0
4.255.255.255/32 receive Loopback0
10.1.12.0/24 10.1.14.1 Ethernet0/0
10.1.12.1/32 10.1.14.1 Ethernet0/0
10.1.14.0/24 attached Ethernet0/0
10.1.14.0/32 receive Ethernet0/0
10.1.14.1/32 attached Ethernet0/0
10.1.14.4/32 receive Ethernet0/0
10.1.14.255/32 receive Ethernet0/0
10.1.23.0/24 10.1.34.3 Serial1/0.43
10.1.23.2/32 10.1.34.3 Serial1/0.43
10.1.34.0/24 attached Serial1/0.43
10.1.34.0/32 receive Serial1/0.43
10.1.34.3/32 10.1.34.3 Serial1/0.43
Prefix Next Hop Interface
10.1.34.4/32 receive Serial1/0.43
10.1.34.255/32 receive Serial1/0.43
11.0.0.0/8 10.1.14.1 Ethernet0/0
127.0.0.0/8 drop
224.0.0.0/4 drop
224.0.0.0/24 receive
240.0.0.0/4 drop
255.255.255.255/32 receive
R4#
Traceroute :
R4#trace 11.1.1.1
Type escape sequence to abort.
Tracing the route to 11.1.1.1
1 10.1.14.1 4 msec * 0 msec
Did the sh ip route 11.1.1.1, it showed 10.1.12.1 as the next hop. But the cef
listed the next hop to 10.1.14.1 (which is directly connected) rather than
10.1.12.1 (few hops away) as commanded by Local-Pref.
Absurd, still try to find what's goin on ... Let me know if i still missed
anything...
Brgds
Benny
> Date: Mon, 27 Feb 2012 10:32:50 +0530
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> Subject: Re: [OSL | CCIE_RS] Local Preference issue.
>
> Yes, it would be more specific route directing traffic towards 14.1 as we
> believe. Can you check routing table and CEF table for the below one.
>
> show ip route 11.1.1.1
> show ip cef ..
>
> venkee
>
> On 27 February 2012 00:26, Rob Pool <[email protected]> wrote:
>
> > If it had the same route in an igp an r would show up because the BGP
> > route would prevent it from being inserted in the rib. However, a more
> > specific route in an igp wouldn't prevent the less specific BGP route from
> > being inserted.
> >
> > Sent from my iPhone
> >
> > On Feb 26, 2012, at 1:49 PM, <[email protected]> wrote:
> >
> > > If it had a more specific route from another protocol, wouldn't a "r"
> > for "rib failure"show up for the route in the "sh ip bgp" command?
> > >
> > > Could an ICMP redirect from 10.1.12.1 is causing this?
> > >
> > > Doug
> > > -------- Original Message --------
> > > Subject: Re: [OSL | CCIE_RS] Local Preference issue.
> > > From: Rob Pool <[email protected]>
> > > Date: Sun, February 26, 2012 10:41 am
> > > To: Benny Sumardy <[email protected]>
> > > Cc: CCIE ONLINE STUDY LIST <[email protected]>
> > >
> > > My guess would be that you have a more specific route being provided by
> > an igp or static route.
> > >
> > > Sent from my iPhone
> > >
> > > On Feb 26, 2012, at 12:05 PM, Benny Sumardy <[email protected]>
> > wrote:
> > >
> > > >
> > > > Hi,
> > > >
> > > > Applied a local pref value for network 11.0.0.0 (as shown below), so
> > the best route will prefer 10.1.12.1 (3 hops) than 10.1.14.1 (1 hop).
> > > > But when I do a traceroute, the result still gone through 10.1.14.1.
> > Can anybody help on what's missing here? Thanks
> > > >
> > > > Rgds
> > > > Ben
> > > >
> > > >
> > > > R4(config-router)#do sib
> > > > BGP table version is 7, local router ID is 4.4.4.4
> > > > 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
> > > > *> 1.0.0.0 10.1.14.1 0 400 0 100 i
> > > > *>i2.0.0.0 10.1.23.2 0 100 0 i
> > > > *>i3.0.0.0 10.1.34.3 0 100 0 i
> > > > *> 4.0.0.0 0.0.0.0 0 32768 i
> > > > *>i11.0.0.0 10.1.12.1 0 400 0 100 i
> > > > * 10.1.14.1 0 0 100 i
> > > > R4(config-router)#do trace 11.1.1.1
> > > >
> > > > Type escape sequence to abort.
> > > > Tracing the route to 11.1.1.1
> > > >
> > > > 1 10.1.14.1 12 msec * 0 msec
> > > > R4(config-router)#do sir 11.0.0.0
> > > > Routing entry for 11.0.0.0/8
> > > > Known via "bgp 200", distance 200, metric 0
> > > > Tag 100, type internal
> > > > Last update from 10.1.12.1 00:01:14 ago
> > > > Routing Descriptor Blocks:
> > > > * 10.1.12.1, from 10.1.23.2, 00:01:14 ago
> > > > Route metric is 0, traffic share count is 1
> > > > AS Hops 1
> > > > Route tag 100
> > > > MPLS label: none
> > > > R4(config-router)#
> > > > R4(config-router)#do trace 11.1.1.1
> > > >
> > > > Type escape sequence to abort.
> > > > Tracing the route to 11.1.1.1
> > > >
> > > > 1 10.1.14.1 4 msec * 4 msec
> > > > R4(config-router)#
> > > >
> > > > _______________________________________________
> > > > For more information regarding industry leading CCIE Lab training,
> > please visit www.ipexpert.com
> > > >
> > > > Are you a CCNP or CCIE and looking for a job? Check out
> > www.PlatinumPlacement.com
> > > >
> > > > http://onlinestudylist.com/mailman/listinfo/ccie_rs
> > > _______________________________________________
> > > For more information regarding industry leading CCIE Lab training,
> > please visit www.ipexpert.com
> > >
> > > Are you a CCNP or CCIE and looking for a job? Check out
> > www.PlatinumPlacement.com
> > >
> > > http://onlinestudylist.com/mailman/listinfo/ccie_rs
> > _______________________________________________
> > For more information regarding industry leading CCIE Lab training, please
> > visit www.ipexpert.com
> >
> > Are you a CCNP or CCIE and looking for a job? Check out
> > www.PlatinumPlacement.com
> >
> > http://onlinestudylist.com/mailman/listinfo/ccie_rs
> >
> _______________________________________________
> For more information regarding industry leading CCIE Lab training, please
> visit www.ipexpert.com
>
> Are you a CCNP or CCIE and looking for a job? Check out
> www.PlatinumPlacement.com
>
> http://onlinestudylist.com/mailman/listinfo/ccie_rs
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
http://onlinestudylist.com/mailman/listinfo/ccie_rs
