BGP problem

Answered Question
Nov 28th, 2009
Hi,
need to configure a BGP between 2 switched cisco 3750.
I've configured the BGP but I can't distribute the net 200.168.57.168/27 to the sw3750NUMBER2 (see below the conf.).
Please can someone help me ?
sw3750NUMBER1
!
interface Vlan3231
description ** BGP session interface **
ip address 169.254.231.1 255.255.255.248
!
router bgp 65534
no synchronization
bgp router-id 169.254.231.1
bgp log-neighbor-changes
network 192.168.57.128 mask 255.255.255.224
neighbor 169.254.231.5 remote-as 65532
neighbor 169.254.231.5 transport path-mtu-discovery
neighbor 169.254.231.5 description ** to - sw3750NUMBER2 - Vlan3231 **
neighbor 169.254.231.5 update-source Vlan3231
neighbor 169.254.231.5 soft-reconfiguration inbound
neighbor 169.254.231.5 prefix-list 169.254.231.5-in in
neighbor 169.254.231.5 prefix-list 169.254.231.5-out out
no auto-summary
!
!
ip prefix-list 169.254.231.5-in seq 5 permit 169.254.231.0/29
!
ip prefix-list 169.254.231.5-out seq 5 permit 169.254.231.0/29
ip prefix-list 169.254.231.5-out seq 10 permit 192.168.57.128/27
ip prefix-list 169.254.231.5-out seq 15 permit 200.168.57.128/27
!
sw3750NUMBER2
!
interface Vlan3231
description ** BGP session interface **
ip address 169.254.231.5 255.255.255.248
!        
router bgp 65532
no synchronization
bgp router-id 169.254.231.5
bgp log-neighbor-changes
network 169.254.231.0 mask 255.255.255.248
neighbor 169.254.231.1 remote-as 65534
neighbor 169.254.231.1 transport path-mtu-discovery
neighbor 169.254.231.1 description ** to - sw3750NUMBER1 - Vlan3231 **
neighbor 169.254.231.1 update-source Vlan3231
neighbor 169.254.231.1 soft-reconfiguration inbound
neighbor 169.254.231.1 prefix-list 169.254.231.1-in in
neighbor 169.254.231.1 prefix-list 169.254.231.1-out out
no auto-summary
!
!
ip prefix-list 169.254.231.1-in seq 5 permit 192.168.57.128/27
ip prefix-list 169.254.231.1-in seq 10 permit 169.254.231.0/29
ip prefix-list 169.254.231.1-in seq 15 permit 200.168.57.128/27
!
ip prefix-list 169.254.231.1-out seq 5 permit 169.254.231.0/29
!
sw3750NUMBER1#
sw3750NUMBER1#$eighbors 169.254.231.5 advertised-routes
BGP table version is 6, local router ID is 169.254.231.1
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
*> 192.168.57.128/27
                    0.0.0.0                  0         32768 i
Total number of prefixes 1
itmil-calinf0r2-sw01DCMItoDCVR#sh ip bgp                                
BGP table version is 6, local router ID is 169.254.231.1
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> 169.254.231.0/29 169.254.231.5            0             0 65532 i
*> 192.168.57.128/27
                    0.0.0.0                  0         32768 i
* i                 192.168.57.130           0    100      0 i
* i                 192.168.57.129           0    100      0 i
sw3750NUMBER1#sh ip bgp neighbors 169.254.231.5        
BGP neighbor is 169.254.231.5,  remote AS 65532, external link
Description: ** CL - InfracomVR - sw3750masterVR - Vlan3231 **
  BGP version 4, remote router ID 169.254.231.5
  BGP state = Established, up for 00:02:03
  Last read 00:00:03, last write 00:00:29, hold time is 180, keepalive interval is 60 seconds
  Neighbor capabilities:
    Route refresh: advertised and received(new)
    Address family IPv4 Unicast: advertised and received
  Message statistics:
    InQ depth is 0
    OutQ depth is 0
                         Sent       Rcvd
    Opens:                139         40
    Notifications:         24         99
    Updates:               31         19
    Keepalives:          1571       1571
    Route Refresh:          1          1
    Total:               1766       1742
  Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
  BGP table version 6, neighbor version 6/0
  Output queue size : 0
  Index 3, Offset 0, Mask 0x8
  3 update-group member
  Inbound soft reconfiguration allowed
  Incoming update prefix filter list is 169.254.231.5-in
  Outgoing update prefix filter list is 169.254.231.5-out
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               1          1 (Consumes 52 bytes)
    Prefixes Total:                 2          1
    Implicit Withdraw:              1          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          1
    Used as multipath:            n/a          0
                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    Bestpath from this peer:              1        n/a
    Total:                                1          0
  Number of NLRIs in the update sent: max 1, min 1
  Address tracking is enabled, the RIB does have a route to 169.254.231.5
  Address tracking requires at least a /29 route to the peer
  Connections established 17; dropped 16
  Last reset 00:02:15, due to User reset
  Transport(tcp) path-mtu-discovery is enabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Mininum incoming TTL 0, Outgoing TTL 1
Local host: 169.254.231.1, Local port: 38162
Foreign host: 169.254.231.5, Foreign port: 179
Enqueued packets for retransmit: 0, input: 0  mis-ordered: 0 (0 bytes)
Event Timers (current time is 0xAC9D4E0):
Timer          Starts    Wakeups            Next
Retrans             6          0             0x0
TimeWait            0          0             0x0
AckHold             4          3             0x0
SendWnd             0          0             0x0
KeepAlive           0          0             0x0
GiveUp              0          0             0x0
PmtuAger            1          0       0xAD0DC62
DeadWait            0          0             0x0
iss:  995371965  snduna:  995372167  sndnxt:  995372167     sndwnd:  16183
irs:   16606577  rcvnxt:   16606752  rcvwnd:      16210  delrcvwnd:    174
SRTT: 165 ms, RTTO: 1172 ms, RTV: 1007 ms, KRTT: 0 ms
minRTT: 8 ms, maxRTT: 300 ms, ACK hold: 200 ms
Flags: higher precedence, nagle, path mtu capable, md5
Datagrams (max data segment is 1440 bytes):
Rcvd: 10 (out of order: 0), with data: 6, total data bytes: 174
Sent: 11 (retransmit: 0), with data: 6, total data bytes: 201
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Correct Answer by Jon Marshall about 7 years 1 month ago

r.taccon wrote:

Hi,
need to configure a BGP between 2 switched cisco 3750.
I've configured the BGP but I can't distribute the net 200.168.57.168/27 to the sw3750NUMBER2 (see below the conf.).
Please can someone help me ?
sw3750NUMBER1
!
interface Vlan3231
description ** BGP session interface **
ip address 169.254.231.1 255.255.255.248
!
router bgp 65534
no synchronization
bgp router-id 169.254.231.1
bgp log-neighbor-changes
network 192.168.57.128 mask 255.255.255.224
neighbor 169.254.231.5 remote-as 65532
neighbor 169.254.231.5 transport path-mtu-discovery
neighbor 169.254.231.5 description ** to - sw3750NUMBER2 - Vlan3231 **
neighbor 169.254.231.5 update-source Vlan3231
neighbor 169.254.231.5 soft-reconfiguration inbound
neighbor 169.254.231.5 prefix-list 169.254.231.5-in in
neighbor 169.254.231.5 prefix-list 169.254.231.5-out out
no auto-summary
!
!
ip prefix-list 169.254.231.5-in seq 5 permit 169.254.231.0/29
!
ip prefix-list 169.254.231.5-out seq 5 permit 169.254.231.0/29
ip prefix-list 169.254.231.5-out seq 10 permit 192.168.57.128/27
ip prefix-list 169.254.231.5-out seq 15 permit 200.168.57.128/27
!

Is this a typo in your router bgp config because you do not have a network statement for that route so unless you are receiving it from another peer you will need to add in a network statement. You will also need an entry in the routing table on switch1 for that network

router bgp 65534

network 200.168.57.128 mask 255.255.255.224

Jon

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Correct Answer
Jon Marshall Sat, 11/28/2009 - 11:19

r.taccon wrote:

Hi,
need to configure a BGP between 2 switched cisco 3750.
I've configured the BGP but I can't distribute the net 200.168.57.168/27 to the sw3750NUMBER2 (see below the conf.).
Please can someone help me ?
sw3750NUMBER1
!
interface Vlan3231
description ** BGP session interface **
ip address 169.254.231.1 255.255.255.248
!
router bgp 65534
no synchronization
bgp router-id 169.254.231.1
bgp log-neighbor-changes
network 192.168.57.128 mask 255.255.255.224
neighbor 169.254.231.5 remote-as 65532
neighbor 169.254.231.5 transport path-mtu-discovery
neighbor 169.254.231.5 description ** to - sw3750NUMBER2 - Vlan3231 **
neighbor 169.254.231.5 update-source Vlan3231
neighbor 169.254.231.5 soft-reconfiguration inbound
neighbor 169.254.231.5 prefix-list 169.254.231.5-in in
neighbor 169.254.231.5 prefix-list 169.254.231.5-out out
no auto-summary
!
!
ip prefix-list 169.254.231.5-in seq 5 permit 169.254.231.0/29
!
ip prefix-list 169.254.231.5-out seq 5 permit 169.254.231.0/29
ip prefix-list 169.254.231.5-out seq 10 permit 192.168.57.128/27
ip prefix-list 169.254.231.5-out seq 15 permit 200.168.57.128/27
!

Is this a typo in your router bgp config because you do not have a network statement for that route so unless you are receiving it from another peer you will need to add in a network statement. You will also need an entry in the routing table on switch1 for that network

router bgp 65534

network 200.168.57.128 mask 255.255.255.224

Jon

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