تكوين تعطيل النظير-as-check في BGP على محولات Cisco Nexus

configure terminal
!
hostname R1
!
interface Loopback0
 ip address 10.255.255.1 255.255.255.255
!
interface GigabitEthernet0/1
 ip address 10.1.2.1 255.255.255.0
 no shutdown
!
router bgp 64512
 bgp log-neighbor-changes
 network 10.255.255.1 mask 255.255.255.255
 neighbor 10.1.2.2 remote-as 65535
!
end

configure terminal
!
hostname N7K-2
!
feature bgp
!
interface Ethernet2/1
  no switchport
  ip address 10.1.2.2/24
  no shutdown

interface Ethernet2/2
  no switchport
  ip address 10.2.3.2/24
  no shutdown
!
router bgp 65535
  address-family ipv4 unicast
  neighbor 10.1.2.1
    remote-as 64512
    address-family ipv4 unicast
  neighbor 10.2.3.3
    remote-as 64512
    address-family ipv4 unicast
!
end

configure terminal
!
hostname R3
!
interface GigabitEthernet0/1
 ip address 10.2.3.3 255.255.255.0
 no shutdown
!
router bgp 64512
 bgp log-neighbor-changes
 neighbor 10.2.3.2 remote-as 65535
!
end

N7K-2# show bgp ipv4 unicast
BGP routing table information for VRF default, address family IPv4 Unicast
BGP table version is 17, local router ID is 10.1.2.2
Status: s-suppressed, x-deleted, S-stale, d-dampened, h-history, *-valid, >-best
Path type: i-internal, e-external, c-confed, l-local, a-aggregate, r-redist, I-i
njected
Origin codes: i - IGP, e - EGP, ? - incomplete, | - multipath, & - backup

   Network            Next Hop            Metric     LocPrf     Weight Path
*>e10.255.255.1/32    10.1.2.1                 0                     0 64512 i

N7K-2# 

R3#debug bgp ipv4 unicast 
BGP debugging is on for address family: IPv4 Unicast 
R3#
R3#clear bgp ipv4 unicast * soft 
R3#
*Jul 15 19:22:36.427: BGP: 10.2.3.2 sending REFRESH_REQ(5) for afi/safi: 1/1, refresh code is 0
R3#

N7K-2# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
N7K-2(config)# router bgp 65535
N7K-2(config-router)# neighbor 10.2.3.3
N7K-2(config-router-neighbor)# address-family ipv4 unicast 
N7K-2(config-router-neighbor-af)# disable-peer-as-check
N7K-2(config-router-neighbor-af)#

R3#
*Jul 15 19:29:06.440: BGP(0): 10.2.3.2 rcv UPDATE w/ attr: nexthop 10.2.3.2, origin i, originator 0.0.0.0, merged path 65535 64512, AS_PATH , community , extended community , SSA attribute 
*Jul 15 19:29:06.442: BGPSSA ssacount is 0
*Jul 15 19:29:06.442: BGP(0): 10.2.3.2 rcv UPDATE about 10.255.255.1/32 -- DENIED due to: AS-PATH contains our own AS;
R3#

configure terminal
!
route-map TEST permit 10
  set as-path prepend 65300
!

N7K-2# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
N7K-2(config)# router bgp 65535
N7K-2(config-router)#   neighbor 10.1.2.1
N7K-2(config-router-neighbor)#     address-family ipv4 unicast
N7K-2(config-router-neighbor-af)# route-map TEST in
N7K-2(config-router-neighbor-af)# 
N7K-2# 

N7K-2# show bgp ipv4 unicast
BGP routing table information for VRF default, address family IPv4 Unicast
BGP table version is 18, local router ID is 10.1.2.2
Status: s-suppressed, x-deleted, S-stale, d-dampened, h-history, *-valid, >-best
Path type: i-internal, e-external, c-confed, l-local, a-aggregate, r-redist, I-injected
Origin codes: i - IGP, e - EGP, ? - incomplete, | - multipath, & - backup

   Network            Next Hop            Metric     LocPrf     Weight Path
*>e10.255.255.1/32    10.1.2.1                 0                     0 65300 64512 i

N7K-2# 

N7K-2# sh run bgp 

!Command: show running-config bgp
!Time: Mon Jul 15 21:28:59 2019

version 7.3(0)D1(1)
feature bgp

router bgp 65535
  address-family ipv4 unicast
  neighbor 10.1.2.1
    remote-as 64512
    address-family ipv4 unicast
      route-map TEST in
  neighbor 10.2.3.3
    remote-as 64512
    address-family ipv4 unicast


N7K-2# 

R3#show debug
IP routing:
  BGP debugging is on for address family: IPv4 Unicast 
  BGP updates debugging is on for address family: IPv4 Unicast 

R3#
R3#clear bgp ipv4 unicast * soft
R3#
*Jul 15 21:33:11.309: BGP: 10.2.3.2 sending REFRESH_REQ(5) for afi/safi: 1/1, refresh code is 0
*Jul 15 21:33:12.312: BGP(0): 10.2.3.2 rcv UPDATE w/ attr: nexthop 10.2.3.2, origin i, originator 0.0.0.0, merged path 65535 65300 64512, AS_PATH , community , extended community , SSA attribute 
*Jul 15 21:33:12.313: BGPSSA ssacount is 0
*Jul 15 21:33:12.313: BGP(0): 10.2.3.2 rcv UPDATE about 10.255.255.1/32 -- DENIED due to: AS-PATH contains our own AS;    
R3#

N7K-2# debug-filter bgp neighbor 10.2.3.3
N7K-2# debug-filter bgp prefix 10.255.255.1/32
N7K-2# debug bgp updates
N7K-2# 
N7K-2# debug logfile bgpdebug.log

N7K-2# show debug logfile bgpdebug.log
2019 Jul 15 21:38:12.586085 bgp: 65535 [7848] (default) UPD: [IPv4 Unicast] Continuing update run for peer 10.2.3.3 (#0) 
2019 Jul 15 21:38:12.586129 bgp: 65535 [7848] (default) UPD: [IPv4 Unicast] consider sending 10.255.255.1/32 to peer 10.2.3.3, path-id 1, best-ext is off
2019 Jul 15 21:38:12.586145 bgp: 65535 [7848] (default) UPD: [IPv4 Unicast] 10.2.3.3 10.255.255.1/32 path-id 1 not sent to peer due to: advertising AS 
2019 Jul 15 21:38:12.586160 bgp: 65535 [7848] (default) UPD: [IPv4 Unicast] 10.2.3.3: walked 0 nodes and packed 0/0 prefixes 
2019 Jul 15 21:38:12.586177 bgp: 65535 [7848] (default) UPD: [IPv4 Unicast] Found marker dest 0xf35349f0 on xmitlist for peer 10.2.3.3 (sent prefixes: 0) 
2019 Jul 15 21:38:12.586200 bgp: 65535 [7848] (default) UPD: [IPv4 Unicast] Created EOR marker UPDATE msg (len 23) to peer 10.2.3.3 afer sending 0 routes 
2019 Jul 15 21:38:12.586213 bgp: 65535 [7848] (default) UPD: [IPv4 Unicast] (#24) Suspending update run for peer 10.2.3.3 (#24) 
N7K-2#