From: Tyson Scott (tscott@ipexpert.com)
Date: Wed Mar 25 2009 - 16:08:05 ART
How is an IS-IS router to learn about the BGP networks without advertising
BGP into the IGP? Either add the interfaces to IS-IS or redistribute.
Regards,
Tyson Scott - CCIE #13513 R&S and Security
Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Cell: +1.248.504.7309
Fax: +1.810.454.0130
Mailto: tscott@ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Vignesh Sethuraman
Sent: Wednesday, March 25, 2009 2:58 PM
To: Cisco certification
Subject: CCIE SP - BGP networks are not reachable
Hello Experts,
The following is my scenario.
R3 -- serial -- R1--- ATMSW --- R2----- Ethern--- R4 ---- FRSW ----R5 ----
Ethern--- R6
I have published interface e0/0 of R3 and e0/1 from R6 in BGP .These
interfaces are standalone interfaces i.e stub interfaces and are not
connected to any devices and they are up.
Since MPLS is used to avoid running BGP in the core, i have configured IS-IS
as core routing protocol and configured mpls on all the devices.
But still the BGP networks are not reachable. They are rechable if i
redistribute them into IGP or run BGP everywhere but with MPLS running in
the core they are not reachable.
*R1*:
interface Loopback0
ip address 150.1.1.1 255.255.255.0
ip router isis
!
interface Serial2/1
ip address 150.1.13.1 255.255.255.0
ip router isis
mpls mtu 1516
mpls ldp discovery transport-address interface
mpls ip
serial restart-delay 0
!
interface ATM4/0
description Put ATM PVC Configs Here
ip address 150.1.12.1 255.255.255.0
ip router isis
no atm enable-ilmi-trap
mpls ip
pvc 0/102
protocol ip 150.1.12.2 broadcast
protocol clns 49.0024.0000.0000.0002.00 broadcast
!
!
router isis
net 49.0001.0000.0001.00
!
*R2*:
interface Loopback0
ip address 150.1.2.2 255.255.255.0
ip router isis
!
interface Loopback1
ip address 150.1.22.2 255.255.255.0
ip router isis
!
interface FastEthernet0/0
ip address 150.1.24.2 255.255.255.0
ip router isis
duplex half
mpls mtu 1516
mpls ip
isis circuit-type level-2-only
!
interface ATM4/0
description Put ATM PVC Configs Here
ip address 150.1.12.2 255.255.255.0
ip router isis
no atm enable-ilmi-trap
mpls ip
pvc 0/201
protocol clns 49.0001.0000.0001.00 broadcast
protocol ip 150.1.12.1 broadcast
!
!
router isis
net 49.0024.0000.0000.0002.00
!
*R3:*
!
interface Loopback0
ip address 150.1.3.3 255.255.255.0
ip router isis
!
interface Loopback1
ip address 150.1.33.3 255.255.255.0
!
interface Ethernet0/0
ip address 150.1.37.3 255.255.255.0
half-duplex
mpls ip
!
interface Serial1/2
ip address 150.1.13.3 255.255.255.0
ip router isis
mpls ldp discovery transport-address interface
mpls ip
mpls mtu 1516
serial restart-delay 0
clock rate 64000
!
router isis
net 49.0003.0000.0000.0003.00
!
router bgp 300
no synchronization
bgp log-neighbor-changes
network 150.1.37.0 mask 255.255.255.0
neighbor 150.1.56.6 remote-as 600
neighbor 150.1.56.6 ebgp-multihop 255
no auto-summary
*R4*:
!
interface Loopback0
ip address 150.1.4.4 255.255.255.0
ip router isis
!
interface Loopback1
ip address 150.1.44.4 255.255.255.0
ip router isis
!
interface Ethernet0/0
ip address 150.1.24.4 255.255.255.0
ip router isis
half-duplex
mpls ip
mpls mtu 1516
isis circuit-type level-2-only
!
interface Serial1/0
ip address 150.1.45.4 255.255.255.0
ip router isis
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 150.1.45.5 405 broadcast
frame-relay map clns 405 broadcast
no frame-relay inverse-arp
!
router isis
net 49.0024.0000.0000.0004.00
*R5*:
!
interface Loopback0
ip address 150.1.5.5 255.255.255.0
ip router isis
!
interface Ethernet0/1
ip address 150.1.56.5 255.255.255.0
ip router isis
half-duplex
mpls ldp discovery transport-address interface
mpls ip
mpls mtu 1516
!
interface Serial1/0
ip address 150.1.45.5 255.255.255.0
ip router isis
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 150.1.45.4 504 broadcast
frame-relay map clns 504 broadcast
no frame-relay inverse-arp
router isis
net 49.0005.0000.0000.0005.00
*
R6:*
interface Loopback0
ip address 150.1.6.6 255.255.255.0
ip router isis
!
interface Ethernet0/0
ip address 150.1.56.6 255.255.255.0
ip router isis
half-duplex
mpls ldp discovery transport-address interface
mpls ip
mpls mtu 1516
!
interface Ethernet0/1
ip address 150.1.68.6 255.255.255.0
half-duplex
mpls ip
!
router isis
net 49.0005.0000.0000.0006.00
!
router bgp 600
no synchronization
bgp log-neighbor-changes
network 150.1.68.0 mask 255.255.255.0
neighbor 150.1.13.3 remote-as 300
neighbor 150.1.13.3 ebgp-multihop 255
no auto-summary
To ensure i have IGP connectivity, i ping from R3 loopback to R6 loopback
*
Rack1R3#ping 150.1.6.6 source lo0*
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 150.1.6.6, timeout is 2 seconds:
Packet sent with a source address of 150.1.3.3
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 64/90/136 ms
*Rack1R3#sh ip bgp *
BGP table version is 3, local router ID is 150.1.33.3
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
*> 150.1.37.0/24 0.0.0.0 0 32768 i
*> 150.1.68.0/24 150.1.56.6 0 0 600 i
*Rack1R3#sh ip route bgp*
150.1.0.0/24 is subnetted, 16 subnets
B 150.1.68.0 [20/0] via 150.1.56.6, 01:28:46
*Rack1R6#sh ip bgp*
BGP table version is 3, local router ID is 150.1.6.6
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
*> 150.1.37.0/24 150.1.13.3 0 0 300 i
*> 150.1.68.0/24 0.0.0.0 0 32768 i
*Rack1R6#sh ip route bgp*
150.1.0.0/24 is subnetted, 15 subnets
B 150.1.37.0 [20/0] via 150.1.13.3, 01:28:31
*Rack1R3#sh mpls ldp neighbor*
Peer LDP Ident: 150.1.6.6:0; Local LDP Ident 150.1.3.3:0
TCP connection: 150.1.6.6.40286 - 150.1.3.3.646
State: Oper; Msgs sent/rcvd: 129/129; Downstream
Up time: 01:37:04
LDP discovery sources:
Ethernet0/0, Src IP addr: 150.1.68.6
Addresses bound to peer LDP Ident:
150.1.56.6 150.1.6.6 150.1.68.6
Peer LDP Ident: 150.1.22.2:0; Local LDP Ident 150.1.3.3:0
TCP connection: 150.1.22.2.11006 - 150.1.3.3.646
State: Oper; Msgs sent/rcvd: 127/126; Downstream
Up time: 01:37:00
LDP discovery sources:
Ethernet0/0, Src IP addr: 150.1.24.2
Addresses bound to peer LDP Ident:
150.1.24.2 150.1.12.2 150.1.2.2 150.1.22.2
Peer LDP Ident: 150.1.44.4:0; Local LDP Ident 150.1.3.3:0
TCP connection: 150.1.44.4.27419 - 150.1.3.3.646
State: Oper; Msgs sent/rcvd: 129/126; Downstream
Up time: 01:37:00
LDP discovery sources:
Ethernet0/0, Src IP addr: 150.1.24.4
Addresses bound to peer LDP Ident:
150.1.24.4 150.1.45.4 150.1.4.4 150.1.44.4
Peer LDP Ident: 150.1.1.1:0; Local LDP Ident 150.1.3.3:0
TCP connection: 150.1.13.1.646 - 150.1.13.3.30391
State: Oper; Msgs sent/rcvd: 76/73; Downstream
Up time: 00:50:52
LDP discovery sources:
Serial1/2, Src IP addr: 150.1.13.1
Addresses bound to peer LDP Ident:
150.1.13.1 150.1.12.1 150.1.1.1
Peer LDP Ident: 150.1.5.5:0; Local LDP Ident 150.1.3.3:0
TCP connection: 150.1.56.5.41845 - 150.1.3.3.646
State: Oper; Msgs sent/rcvd: 75/73; Downstream
Up time: 00:50:09
LDP discovery sources:
Ethernet0/0, Src IP addr: 150.1.56.5
Addresses bound to peer LDP Ident:
150.1.56.5 150.1.45.5 150.1.5.5
*
R6:*
*Rack1R6#sh mpls ldp neighbor*
Peer LDP Ident: 150.1.44.4:0; Local LDP Ident 150.1.6.6:0
TCP connection: 150.1.44.4.21306 - 150.1.6.6.646
State: Oper; Msgs sent/rcvd: 133/132; Downstream
Up time: 01:41:24
LDP discovery sources:
Ethernet0/1, Src IP addr: 150.1.24.4
Ethernet0/0, Src IP addr: 150.1.24.4
Addresses bound to peer LDP Ident:
150.1.24.4 150.1.45.4 150.1.4.4 150.1.44.4
Peer LDP Ident: 150.1.22.2:0; Local LDP Ident 150.1.6.6:0
TCP connection: 150.1.22.2.11004 - 150.1.6.6.646
State: Oper; Msgs sent/rcvd: 134/132; Downstream
Up time: 01:41:24
LDP discovery sources:
Ethernet0/1, Src IP addr: 150.1.24.2
Ethernet0/0, Src IP addr: 150.1.24.2
Addresses bound to peer LDP Ident:
150.1.24.2 150.1.12.2 150.1.2.2 150.1.22.2
Peer LDP Ident: 150.1.3.3:0; Local LDP Ident 150.1.6.6:0
TCP connection: 150.1.3.3.646 - 150.1.6.6.40286
State: Oper; Msgs sent/rcvd: 130/131; Downstream
Up time: 01:38:26
LDP discovery sources:
Ethernet0/1, Src IP addr: 150.1.37.3
Ethernet0/0, Src IP addr: 150.1.37.3
Addresses bound to peer LDP Ident:
150.1.13.3 150.1.3.3 150.1.33.3 150.1.37.3
Peer LDP Ident: 150.1.5.5:0; Local LDP Ident 150.1.6.6:0
TCP connection: 150.1.56.5.12857 - 150.1.6.6.646
State: Oper; Msgs sent/rcvd: 76/74; Downstream
Up time: 00:51:32
LDP discovery sources:
Ethernet0/0, Src IP addr: 150.1.56.5
Ethernet0/1, Src IP addr: 150.1.56.5
Addresses bound to peer LDP Ident:
150.1.56.5 150.1.45.5 150.1.5.5
Could you please any one tell me what i am missing here and why the BGP
networks are not reachable.
Thanks,
Vignesh
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Mon Apr 06 2009 - 06:44:07 ART