我正在尝试这样做:通过多个本地路由器双归属于一个ISP的负载分担。唯一的区别是ISP发送的是一个完整的BGP表,而不是默认的网关。我有一个问题,R101不会为R102的外部路由做广告,这会导致R 102‘S上游节点断开时出现问题,而R102失去了所有的路由。
router bgp 6001
no synchronization
bgp router-id 1.1.2.253
bgp log-neighbor-changes
network 1.1.1.0
network 1.1.2.0
neighbor 2.1.1.249 remote-as 6000
neighbor 2.1.1.249 soft-reconfiguration inbound
neighbor 2.1.1.249 prefix-list 3 in
neighbor 2.1.1.249 route-map R1-DC-MAP out
neighbor 1.1.2.254 remote-as 6001
neighbor 1.1.2.254 next-hop-self
neighbor 1.1.2.254 soft-reconfiguration inbound
maximum-paths 2
no auto-summary
!
ip prefix-list 1 seq 5 permit 1.1.1.0/24
ip prefix-list 2 seq 5 permit 1.1.2.0/24
ip prefix-list 3 seq 5 deny 1.1.1.0/23
ip prefix-list 3 seq 10 permit any
!
route-map R1-DC-MAP permit 10
match ip address prefix-list 1
set as-path prepend 6001 6001 6001
!
route-map R1-DC-MAP permit 20
match ip address prefix-list 2
!
route-map R1-DC-MAP deny 200router bgp 6001
no synchronization
bgp router-id 1.1.2.254
bgp log-neighbor-changes
network 1.1.1.0
network 1.1.2.0
neighbor 3.1.1.25 remote-as 6000
neighbor 3.1.1.25 soft-reconfiguration inbound
neighbor 3.1.1.25 prefix-list 3 in
neighbor 3.1.1.25 route-map R2-SIX-MAP out
neighbor 1.1.2.253 remote-as 6001
neighbor 1.1.2.253 next-hop-self
neighbor 1.1.2.253 soft-reconfiguration inbound
maximum-paths 2
no auto-summary
!
ip prefix-list 1 seq 5 permit 1.1.2.0/24
ip prefix-list 2 seq 5 permit 1.1.1.0/24
ip prefix-list 3 seq 5 deny 1.1.1.0/23
ip prefix-list 3 seq 10 permit any
!
route-map R2-SIX-MAP permit 10
match ip address prefix-list 1
set as-path prepend 6001 6001 6001
!
route-map R2-SIX-MAP permit 20
match ip address prefix-list 2
!
route-map R2-SIX-MAP deny 30
match ip address 1.1.1.0/23
!
route-map R2-SIX-MAP deny 200
!
ip forwarding
!
line vty
!
endInterface vlan3 is up, line protocol detection is disabled
inet 1.1.1.253/30 broadcast 1.1.1.255
Interface vlan4 is up, line protocol detection is disabled
inet 2.1.1.253/29 broadcast 2.1.1.255
Interface vlan101 is up, line protocol detection is disabled
inet 1.1.1.61/26 broadcast 1.1.1.63
inet 1.1.1.1/32 broadcast 1.1.1.1
Interface vlan106 is up, line protocol detection is disabled
inet 1.1.1.125/27 broadcast 1.1.1.127
inet 1.1.1.97/32 broadcast 1.1.1.97
Interface vlan107 is up, line protocol detection is disabled
inet 1.1.1.141/28 broadcast 1.1.1.143
inet 1.1.1.129/28 broadcast 1.1.1.143 secondary
Interface vlan109 is up, line protocol detection is disabled
inet 1.1.1.93/27 broadcast 1.1.1.95
inet 1.1.1.65/32 broadcast 1.1.1.65Interface vlan3 is up, line protocol detection is disabled
inet 1.1.2.254/30 broadcast 1.1.2.255
Interface vlan4 is up, line protocol detection is disabled
inet 3.1.1.29/29 broadcast 3.1.1.31
Interface vlan101 is up, line protocol detection is disabled
inet 1.1.2.62/26 broadcast 1.1.2.63
inet 1.1.2.1/32 broadcast 1.1.2.1
Interface vlan106 is up, line protocol detection is disabled
inet 1.1.2.126/27 broadcast 1.1.2.127
inet 1.1.2.97/32 broadcast 1.1.2.97
Interface vlan107 is up, line protocol detection is disabled
inet 1.1.2.142/28 broadcast 1.1.2.143
inet 1.1.2.129/28 broadcast 1.1.2.143 secondary
Interface vlan109 is up, line protocol detection is disabled
inet 1.1.2.94/27 broadcast 1.1.2.95
inet 1.1.2.65/32 broadcast 1.1.2.65广告在R101上根本不起作用,但我可以看到来自R102的广告。与上游ISP BGP同行的通信如预期的那样工作,我正在从他们那里获得完整的BGP。
BGP table version is 0, local router ID is 1.1.2.253
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path接收
BGP table version is 0, local router ID is 1.1.2.253
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0 1.1.2.254 0 100 0 i
*> 1.1.2.0 1.1.2.254 0 100 0 i
Total number of prefixes 2有没有人有什么想法可能出了什么问题?
发布于 2017-02-19 07:40:47
BGP路由器配置中的网络语句:
network 1.1.1.0
network 1.1.2.0不匹配实际的网络地址,其范围从/26到/32。除非您使用aggregate-address命令,否则BGP不会为与路由表中的内容不完全匹配的网络做广告。BGP中的网络语句将不会构成不存在的路由。
发布于 2015-11-27 00:05:55
我猜问题在于1.1.1.0/24和1.1.2.0/24的支持路线。
要宣布一个前缀,你需要一个肋骨的辅助路线。所以,你应该有1.1.1.0/24和1.1.2.0/24的肋骨,才能宣布它们。
我假设您不能更改SVI的IP地址,因此您可能可以在网络的南部或Null0上输入两条Null0路由。然后BGP网络命令将生效。
https://networkengineering.stackexchange.com/questions/24766
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