![]() No need to add physical link or new IBGP neighbor relationship-configure BGP route reflector. Make the routers in the AS domain fully logically connected, make the IGP routes of RTB and RTC reachable to each other, establish an IBGP neighbor relationship between RTB and RTC, so that RTC can directly pass its own route to RTB router, which is directly Routes to RTA through EBGP neighbor relationship. This fully connected network deployment solution, on the one hand, has a high networking cost, and on the other hand, the increase in the number of BGP connections correspondingly increases the resource consumption of the system, and the fully connected network deployment has poor scalability. The RTB router directly passes the route to RTA through the EBGP neighbor relationship. Let the routers in the AS domain be physically fully connected, add a physical link between RTB and RTC, and establish an IBGP neighbor relationship between RTC and RTB, so that RTC can directly pass its own route to the RTB router. #Route reflector how toHow to solve the problem that split horizon causes R4 and R2 to fail to get the route. Therefore, BGP adopts such a brutal version of horizontal splitting. This situation is intolerable for BGP, a protocol that carries such core and large-scale routing. If the network is large and the interconnection is complicated, loops may still occur. Yes! IGP still has a loop to do so! However, this loop is a loop of a large network, so IGP uses other methods to solve this problem, such as the 16-hop RIP (otherwise, if a horizontal split is all done, RIP does not need the 16-hop setting) the reason is The horizontal split of IGP is just to prevent problems in a small area such as regional networks (such as adjacent routers). IGP can also send updates to other routers, is BGP too worried? If BGP is right, does IGP cause a loop? So, someone asked, since the same is horizontal split, why are the standards different? To put it bluntly is a dead end, no longer in control. ![]() Horizontal split of BGP: The routing information learned from any IBGP neighbors is no longer forwarded to any IBGP router. It is from that mouth that no longer comes out from this mouth. IGP split horizon: The routing information learned from an interface will no longer be advertised from that interface. It is also split horizontally, both in BGP and IGP then: As a result, R2 and R1 cannot get the route of R4 #Route reflector updateSplit horizon: R3 does not send to other IBGP neighbor R2 after receiving the update from IBGP neighbor R4. (The root cause is that within the AS, the AS-PATH will not change and the AS_PATH anti-ring cannot be used, so loops are prone to occur) This is the BGP split horizon rule.ĭue to the principle of split horizon, BGP requires that within the AS, IBGP must be fully interconnected (here it is specified by the neighbor command). In order to prevent the occurrence of loops, BGP routers will not be from IBGP neighbor The learned routes are advertised to other IBGP neighbors.īGP stipulates that the routes learned through one IBGP will not be propagated to all other IBGP neighbors. Therefore, within the AS, IBGP does not have EBGP ring defense capabilities. Go to System > System Settings > BGP Route Reflector.Ĭonfigure the BGP AS# 65001 and the Spines that you will use as your BGP Route Reflectors.BGP ring defense is implemented through AS_PATH, and AS_PATH is only changed when the route leaves the AS.Policy Group: My_Pod_Policy Fabric > Fabric Policies > Pod Policies > Profiles > Pod Profile default Configuration – APIC 3.0(1k) and later Go to Fabric > Fabric Policies > Pod Policies > Profiles > Pod Profile default Go to Fabric > Fabric Policies > Pod Policies > Policy Groups > Create Pod Policy GroupīGP Route Reflector Policy: default Fabric > Fabric Policies > Pod Policies > Policy Groupsģ. Fabric > Fabric Policies > Pod Policies > BGP Route ReflectorĢ. Go to Fabric > Fabric Policies > Pod Policies > Policies > BGP Route Reflector default.Ĭonfigure the BGP AS# 65001 and the Spines that you will use as your BGP Route Reflectors. ![]() To configure the ACI Fabric BGP Route Reflectors, do the following: Once route reflectors have been enabled, you will be able to configure 元 connectivity outside of the fabric. ![]() To enable route reflectors in the ACI fabric, you must select the spine switches that will reflect routes, and you will need to configure a BGP autonomous system number for the fabric. The ACI fabric makes use of route reflectors (MP-BGP) to distribute external routes within the fabric. ![]()
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