sábado, 16 de marzo de 2013

Atributos BGP


Setup BGP


  •  Configurar sesiones iBGP y eBGP como muestra la figura. Utilice en iBGP las loopbacks0 para formar sesión en cada AS. Para NLRI dentro de cada AS con sesiones iBGP utilice OSPF.
  •   R2 debe ser Route-Reflector para R1 y R2, además utilice peer-group.

R1
interface FastEthernet0/0
 ip ospf network point-to-point
 ip ospf 1 area 0

interface Loopback0
 ip ospf 1 area 0

R2
interface FastEthernet0/0
 ip ospf network point-to-point
 ip ospf 1 area 0

interface FastEthernet0/1
 ip ospf network point-to-point
 ip ospf 1 area 0

interface Loopback0
 ip ospf 1 area 0

R3
interface FastEthernet0/1
 ip ospf network point-to-point
 ip ospf 1 area 0

interface Loopback0
 ip ospf 1 area 0

R2#show  ip ospf neighbor
Neighbor ID     Pri   State           Dead Time   Address         Interface
10.3.3.3          0   FULL/  -        00:00:37    10.1.23.3       FastEthernet0/1
10.1.1.1          0   FULL/  -        00:00:37    10.1.12.1       FastEthernet0/0

R1
router bgp 10
 no synchronization
 bgp router-id 10.1.1.1
 bgp log-neighbor-changes
 neighbor 10.2.2.2 remote-as 10
 neighbor 10.2.2.2 update-source Loopback0
 neighbor 172.16.14.4 remote-as 20
 no auto-summary

R2
router bgp 10
 no synchronization
 bgp router-id 10.2.2.2
 bgp log-neighbor-changes
 neighbor AS10 peer-group
 neighbor AS10 remote-as 10
 neighbor AS10 update-source Loopback0
 neighbor AS10 route-reflector-client
 neighbor 10.1.1.1 peer-group AS10
 neighbor 10.3.3.3 peer-group AS10
 no auto-summary

R3
router bgp 10
 no synchronization
 bgp router-id 10.3.3.3
 bgp log-neighbor-changes
 neighbor 10.2.2.2 remote-as 10
 neighbor 10.2.2.2 update-source Loopback0
 neighbor 172.16.34.4 remote-as 20
 neighbor 172.16.36.6 remote-as 30
 no auto-summary

R4
interface FastEthernet0/0
 ip ospf network point-to-point
 ip ospf 1 area 0

interface Loopback0
 ip ospf 1 area 0

R5
interface FastEthernet0/0
 ip ospf network point-to-point
 ip ospf 1 area 0

interface Loopback0
 ip ospf 1 area 0

R4#sh ip route ospf
     20.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O       20.5.5.5/32 [110/2] via 20.1.45.5, 00:00:00, FastEthernet0/0

R4#ping 20.5.5.5 source loopback 0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.5.5.5, timeout is 2 seconds:
Packet sent with a source address of 20.4.4.4
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/36/64 ms

R4
router bgp 20
 no synchronization
 bgp router-id 20.4.4.4
 bgp log-neighbor-changes
 network 20.4.4.4 mask 255.255.255.255
 neighbor 20.5.5.5 remote-as 20
 neighbor 20.5.5.5 update-source Loopback0
 neighbor 172.16.14.1 remote-as 10
 neighbor 172.16.34.3 remote-as 10
 neighbor 172.16.46.6 remote-as 30
 no auto-summary

R5
router bgp 20
 no synchronization
 bgp router-id 20.5.5.5
 bgp log-neighbor-changes
 neighbor 20.4.4.4 remote-as 20
 neighbor 20.4.4.4 update-source Loopback0
 neighbor 172.16.56.6 remote-as 30
 no auto-summary

R6
router bgp 30
 no synchronization
 bgp router-id 30.6.6.6
 bgp log-neighbor-changes
 neighbor 172.16.36.3 remote-as 10
 neighbor 172.16.46.4 remote-as 20
 neighbor 172.16.56.5 remote-as 20
 neighbor 192.168.1.7 remote-as 65400
 no auto-summary

R7
router bgp 65400
 no synchronization
 bgp router-id 100.7.7.7
 bgp log-neighbor-changes
 neighbor 192.168.1.6 remote-as 30
 no auto-summary

R2#show ip bgp summary
BGP router identifier 10.2.2.2, local AS number 10
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
10.1.1.1        4    10      31      31        1    0    0 00:25:59        0
10.3.3.3        4    10      28      28        1    0    0 00:25:13        0

R6#show ip bgp summary
BGP router identifier 30.6.6.6, local AS number 30
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
172.16.36.3     4    10       9       9        1    0    0 00:06:51        0
172.16.46.4     4    20       9       9        1    0    0 00:06:49        0
172.16.56.5     4    20       9       9        1    0    0 00:06:41        0
192.168.1.7     4 65400      29      29        1    0    0 00:01:22        0

  •           Publique en BGP las loopbacks0 de los routers que participan en BGP
  •           R2 y R3 deben publicar la red 23.0.0.0/24
  •  R4 y R5 deben publicar la red 45.0.0.0/24

R2
router bgp 10
 network 23.0.0.0 mask 255.255.255.0

R3
router bgp 10
 network 23.0.0.0 mask 255.255.255.0

R3#show ip bgp
BGP table version is 4, local router ID is 10.3.3.3
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
*> 23.0.0.0/24      0.0.0.0                  0         32768 i
* i                           10.2.2.2                 0    100      0 i

R4
router bgp 20
 network 45.0.0.0 mask 255.255.255.0

R5
router bgp 20
 network 45.0.0.0 mask 255.255.255.0

R5#show ip bgp regexp _$
BGP table version is 3, local router ID is 20.5.5.5
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
*> 45.0.0.0/24      0.0.0.0                  0         32768 i

R1
router bgp 10
 network 10.1.1.1 mask 255.255.255.255

R2
router bgp 10
 network 10.2.2.2 mask 255.255.255.255

R3
router bgp 10
 network 10.3.3.3 mask 255.255.255.255

R4
router bgp 20
 network 20.4.4.4 mask 255.255.255.255

R5
router bgp 20
 network 20.5.5.5 mask 255.255.255.255

R6
router bgp 30
 network 30.6.6.6 mask 255.255.255.255

R7
router bgp 65400
 network 100.7.7.7 mask 255.255.255.255

R2#show ip bgp
BGP table version is 7, local router ID is 10.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
   Network          Next Hop            Metric LocPrf Weight Path
r>i10.1.1.1/32      10.1.1.1                 0    100      0 i
*> 10.2.2.2/32      0.0.0.0                  0         32768 i
r>i10.3.3.3/32      10.3.3.3                 0    100      0 i
* i20.4.4.4/32      172.16.14.4              0    100      0 20 i
* i                 172.16.36.6              0    100      0 30 20 i
* i20.5.5.5/32      172.16.14.4              0    100      0 20 i
* i                 172.16.36.6              0    100      0 30 20 i
* i23.0.0.0/24      10.3.3.3                 0    100      0 i
*>                  0.0.0.0                  0         32768 i
* i30.6.6.6/32      172.16.14.4              0    100      0 20 30 i
* i                 172.16.36.6              0    100      0 30 i
* i45.0.0.0/24      172.16.36.6              0    100      0 30 20 i
* i                 172.16.14.4              0    100      0 20 i
* i100.7.7.7/32     172.16.14.4              0    100      0 20 30 65400 i
* i                 172.16.36.6              0    100      0 30 65400 i

NEXT_HOP
Antes de que R2 pueda instalar las actualizaciones sobre cualquier red externa debemos tener en cuenta que los ASBRs publican las actualizaciones sin modificar el next-hop. Veamos la siguiente salida. Si observamos por ejemplo la red 60.0.0.0/24 veremos que R1 y R3 han publicado como next-hop las direcciones 172.16.14.4 y 172.16.36.3. R2 no sabe cómo alcanzar estas direcciones. Que podemos hacer para que R2 conozca estas direcciones? Redistribuirlas dentro de IGP, no recomendable o que cada ASBR se haga pasar como próximo salto. Veamos cómo.

R6
router bgp 30
 network 60.0.0.0 mask 255.255.255.0

R2#show ip bgp
BGP table version is 7, local router ID is 10.2.2.2
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>i10.1.1.1/32      10.1.1.1                 0    100      0 i
*> 10.2.2.2/32      0.0.0.0                  0         32768 i
r>i10.3.3.3/32      10.3.3.3                 0    100      0 i
* i20.4.4.4/32      10.3.3.3                 0    100      0 20 i
*>i                 10.1.1.1                 0    100      0 20 i
* i20.5.5.5/32      10.3.3.3                 0    100      0 20 i
*>i                 10.1.1.1                 0    100      0 20 i
* i23.0.0.0/24      10.3.3.3                 0    100      0 i
*>                  0.0.0.0                  0         32768 i
*>i30.6.6.6/32      10.3.3.3                 0    100      0 30 i
* i45.0.0.0/24      10.3.3.3                 0    100      0 20 i
*>i                 10.1.1.1                 0    100      0 20 i
*>i60.0.0.0/24      10.3.3.3                 0    100      0 30 i
*>i100.7.7.7/32     10.3.3.3                 0    100      0 30 65400 i

R1
router bgp 10
 neighbor 10.2.2.2 next-hop-self

R3
router bgp 10
 neighbor 10.2.2.2 next-hop-self

R2#show ip bgp
BGP table version is 16, local router ID is 10.2.2.2
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>i10.1.1.1/32      10.1.1.1                 0    100      0 i
*> 10.2.2.2/32      0.0.0.0                  0         32768 i
r>i10.3.3.3/32      10.3.3.3                 0    100      0 i
*>i20.4.4.4/32      10.1.1.1                 0    100      0 20 i
*>i20.5.5.5/32      10.1.1.1                 0    100      0 20 i
* i23.0.0.0/24      10.3.3.3                 0    100      0 i
*>                  0.0.0.0                  0         32768 i
*>i30.6.6.6/32      10.3.3.3                 0    100      0 30 i
*>i45.0.0.0/24      10.1.1.1                 0    100      0 20 i
* i60.0.0.0/24      10.1.1.1                 0    100      0 20 30 i
*>i                           10.3.3.3                 0    100      0 30 i
*>i100.7.7.7/32     10.3.3.3                 0    100      0 30 65400 i

WEIGHT

  • R4 debe acceder a las redes originadas en AS10 a través de R3. Utilice atributo Weight.

R4#show ip bgp regexp ^10$
BGP table version is 22, local router ID is 20.4.4.4
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
*  10.1.1.1/32      172.16.34.3                            0 10 i
*>                          172.16.14.1              0             0 10 i
*  10.2.2.2/32      172.16.34.3                            0 10 i
*>                          172.16.14.1                            0 10 i
*  10.3.3.3/32      172.16.34.3              0             0 10 i
*>                          172.16.14.1                            0 10 i
*  23.0.0.0/24      172.16.34.3              0             0 10 i
*>                          172.16.14.1                            0 10 i

R4
ip as-path access-list 5 permit ^10$

route-map PESO permit 10
 match as-path 5
 set weight 65535

route-map PESO permit 20

router bgp 20
 neighbor 172.16.34.3 route-map PESO in

R4#show ip bgp regexp ^10$
BGP table version is 26, local router ID is 20.4.4.4
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
*> 10.1.1.1/32      172.16.34.3                        65535 10 i
*                             172.16.14.1              0             0 10 i
*> 10.2.2.2/32      172.16.34.3                        65535 10 i
*                             172.16.14.1                            0 10 i
*> 10.3.3.3/32      172.16.34.3              0         65535 10 i
*                             172.16.14.1                            0 10 i
*> 23.0.0.0/24      172.16.34.3              0         65535 10 i
*                             172.16.14.1                            0 10 i

R4#traceroute 10.1.1.1 source loopback 0 probe 1
Type escape sequence to abort.
Tracing the route to 10.1.1.1

  1 172.16.34.3 24 msec
  2 10.1.23.2 116 msec
  3 10.1.12.1 48 msec


LOCAL_PREFERENCE

  • En R5 crear y publicar la red 50.0.0.0/24.
  • AS10 debe acceder a esta red a través de R3. Utilizar atributo LP.

R5
interface Loopback50
 ip address 50.0.0.5 255.255.255.0

router bgp 20
 network 50.0.0.0 mask 255.255.255.0

R2#show ip bgp regexp 20$
BGP table version is 24, local router ID is 10.2.2.2
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
* i20.4.4.4/32      10.3.3.3                 0    100      0 20 i
*>i                         10.1.1.1                 0    100      0 20 i
* i20.5.5.5/32      10.3.3.3                 0    100      0 20 i
*>i                         10.1.1.1                 0    100      0 20 i
* i45.0.0.0/24      10.3.3.3                 0    100      0 20 i
*>i                         10.1.1.1                 0    100      0 20 i
*>i50.0.0.0/24      10.1.1.1                 0    100      0 20 i
* i                           10.3.3.3                 0    100      0 20 i

R3
access-list 1 permit 50.0.0.0

route-map LP permit 10
 match ip address 1
 set local-preference 101

route-map LP permit 20

router bgp 10
 neighbor 172.16.34.4 route-map LP in

R2#show ip bgp regexp 20$
BGP table version is 25, local router ID is 10.2.2.2
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
* i20.4.4.4/32      10.3.3.3                 0    100      0 20 i
*>i                         10.1.1.1                 0    100      0 20 i
* i20.5.5.5/32      10.3.3.3                 0    100      0 20 i
*>i                         10.1.1.1                 0    100      0 20 i
* i45.0.0.0/24      10.3.3.3                 0    100      0 20 i
*>i                         10.1.1.1                 0    100      0 20 i
*>i50.0.0.0/24      10.3.3.3                 0    101      0 20 i

R1#show ip bgp regexp 20$
BGP table version is 25, local router ID is 10.1.1.1
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
*> 20.4.4.4/32      172.16.14.4              0             0 20 i
*> 20.5.5.5/32      172.16.14.4                            0 20 i
*> 45.0.0.0/24      172.16.14.4                            0 20 i
*>i50.0.0.0/24      10.3.3.3                 0    101      0 20 i
*                             172.16.14.4                            0 20 i

AS_PATH

  • R4 debe crear y publicar la red 40.0.0.0/24.
  • R1 debe acceder a la red 40.0.0.0/24 a través de R3. Utilizar atributo AS_PATH

R4
interface Loopback40
 ip address 40.0.0.4 255.255.255.0

router bgp 20
 network 40.0.0.0 mask 255.255.255.0

R1#show ip bgp regexp 20$
BGP table version is 29, local router ID is 10.1.1.1
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
*> 20.4.4.4/32      172.16.14.4              0             0 20 i
*> 20.5.5.5/32      172.16.14.4                            0 20 i
* i40.0.0.0/24      10.3.3.3                 0    100      0 20 i
*>                          172.16.14.4              0             0 20 i
*> 45.0.0.0/24      172.16.14.4                            0 20 i
*>i50.0.0.0/24      10.3.3.3                 0    101      0 20 i
*                             172.16.14.4                            0 20 i


R4
access-list 1 permit 40.0.0.0

route-map AS permit 10
 match ip address 1
 set as-path prepend 20 20 20 20

route-map AS permit 20

router bgp 20
 neighbor 172.16.14.1 route-map AS out

R1#show ip bgp regexp 20$
BGP table version is 31, local router ID is 10.1.1.1
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
*> 20.4.4.4/32      172.16.14.4              0             0 20 i
*> 20.5.5.5/32      172.16.14.4                            0 20 i
*>i40.0.0.0/24      10.3.3.3                 0    100      0 20 i
*                             172.16.14.4              0             0 20 20 20 20 20 i
*> 45.0.0.0/24      172.16.14.4                            0 20 i
*>i50.0.0.0/24      10.3.3.3                 0    101      0 20 i
*                             172.16.14.4                            0 20 i

MED

  •                      R4 y R5 deben publicar la red 45.0.0.0/24.
  •                      R6  debe acceder a la red 45.0.0.0/24 a través de  R5. Utilice atributo MED

R4
router bgp 20
 neighbor 20.5.5.5 next-hop-self

R5
router bgp 20
  neighbor 20.4.4.4 next-hop-self

R4
router bgp 20
 network 45.0.0.0 mask 255.255.255.0

R5
router bgp 20
 network 45.0.0.0 mask 255.255.255.0

R6#show ip bgp regexp 20$
BGP table version is 13, local router ID is 30.6.6.6
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
*  20.4.4.4/32      172.16.36.3                            0 10 20 i
*>                  172.16.46.4              0             0 20 i
*                             172.16.56.5                            0 20 i
*  20.5.5.5/32      172.16.36.3                            0 10 20 i
*>                          172.16.46.4                            0 20 i
*                             172.16.56.5              0             0 20 i
*  40.0.0.0/24      172.16.36.3                            0 10 20 i
*>                           172.16.46.4              0             0 20 i
*                             172.16.56.5                            0 20 i
*  45.0.0.0/24      172.16.36.3                            0 10 20 i
*>                          172.16.46.4              0             0 20 i
*                             172.16.56.5              0             0 20 i
*  50.0.0.0/24      172.16.36.3                            0 10 20 i
*>                          172.16.46.4                            0 20 i
*                             172.16.56.5              0             0 20 i

R4
access-list 2 permit 45.0.0.0

route-map MED permit 10
 match ip address 2
 set metric 65535

route-map MED permit 20

router bgp 20
 neighbor 172.16.46.6 route-map MED out
               
R6#show ip bgp regexp 20$
BGP table version is 14, local router ID is 30.6.6.6
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
*  20.4.4.4/32      172.16.36.3                            0 10 20 i
*>                          172.16.46.4              0             0 20 i
*                             172.16.56.5                            0 20 i
*  20.5.5.5/32      172.16.36.3                            0 10 20 i
*>                            172.16.46.4                            0 20 i
*                             172.16.56.5              0             0 20 i
*  40.0.0.0/24      172.16.36.3                            0 10 20 i
*>                          172.16.46.4              0             0 20 i
*                             172.16.56.5                            0 20 i
*  45.0.0.0/24      172.16.36.3                            0 10 20 i
*                              172.16.46.4          65535             0 20 i
*>                           172.16.56.5              0             0 20 i
*  50.0.0.0/24      172.16.36.3                            0 10 20 i
*>                           172.16.46.4                            0 20 i
*                             172.16.56.5              0             0 20 i

AGGREGATE ADDRESS
  •             R7 debe crear y publicar en BGP el rango de redes 100.0.0.0/24 a 100.0.7.0/24. Los demás routers solo deben ver el prefijo sumarizado.

R7
interface Loopback100
 ip address 100.0.1.7 255.255.255.0 secondary
 ip address 100.0.2.7 255.255.255.0 secondary
 ip address 100.0.3.7 255.255.255.0 secondary
 ip address 100.0.4.7 255.255.255.0 secondary
 ip address 100.0.5.7 255.255.255.0 secondary
 ip address 100.0.6.7 255.255.255.0 secondary
 ip address 100.0.7.7 255.255.255.0 secondary
 ip address 100.0.0.7 255.255.255.0

R6#show ip bgp regexp 65400$
BGP table version is 23, local router ID is 30.6.6.6
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
*> 100.0.0.0/24     192.168.1.7              0             0 65400 i
*> 100.0.1.0/24     192.168.1.7              0             0 65400 i
*> 100.0.2.0/24     192.168.1.7              0             0 65400 i
*> 100.0.3.0/24     192.168.1.7              0             0 65400 i
*> 100.0.4.0/24     192.168.1.7              0             0 65400 i
*> 100.0.5.0/24     192.168.1.7              0             0 65400 i
*> 100.0.6.0/24     192.168.1.7              0             0 65400 i
*> 100.0.7.0/24     192.168.1.7              0             0 65400 i
*> 100.7.7.7/32     192.168.1.7              0             0 65400 i

R7
 router bgp 65400
 aggregate-address 100.0.0.0 255.255.248.0

R6#show ip bgp regexp 65400$
BGP table version is 23, local router ID is 30.6.6.6
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
*> 100.0.0.0/24     192.168.1.7              0             0 65400 i
*> 100.0.0.0/21     192.168.1.7              0             0 65400 i
*> 100.0.1.0/24     192.168.1.7              0             0 65400 i
*> 100.0.2.0/24     192.168.1.7              0             0 65400 i
*> 100.0.3.0/24     192.168.1.7              0             0 65400 i
*> 100.0.4.0/24     192.168.1.7              0             0 65400 i
*> 100.0.5.0/24     192.168.1.7              0             0 65400 i
*> 100.0.6.0/24     192.168.1.7              0             0 65400 i
*> 100.0.7.0/24     192.168.1.7              0             0 65400 i
*> 100.7.7.7/32     192.168.1.7              0             0 65400 i

  • Por defecto BGP publica el resumen y las redes específicas, debemos incluir la palabra clave summary-only

R7
router bgp 65400
 aggregate-address 100.0.0.0 255.255.248.0 summary-only

R6#show ip bgp regexp 65400$
BGP table version is 51, local router ID is 30.6.6.6
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
*> 100.0.0.0/21     192.168.1.7              0             0 65400 i
*> 100.7.7.7/32     192.168.1.7              0             0 65400 i


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