EBGP和IBGP在技术实现上的第三个区别在路由转发的行为上。通过IBGP学习到的路由,不能传递给其他的IBGP。这么作是为了防止路由环路(loop)。EBGP通过BGP协议里面的AS_PATH和其他元素过滤来自于自己的路由,但是IBGP运行在一个AS内部,没有AS_PATH,所以IBGP干脆不转发来自于其他IBGP的路由。 由于不能转发路由,这要求所有...
EBGP会修改路由的next-hop,再转发;而IBGP默认不会修改next-hop,直接将路由转发。举个例子:R4有一条路由要发出,路由传递到R2,R5,路由的下一跳(next-hop)是R4。 R2通过EBGP将路由传输到R1,由于是EBGP,所以路由的next-hop改为R2。 R1再通过EBGP将路由传递给R3,由于是EBGP,路由的next-hop被改为R1。到此为止,R...
IBGP is used inside autonomous systems. It is used to provide information to your internal routers. It requires all the devices in the same autonomous systems to form full mesh topology or either of Route reflectors and Confederation for prefix learning. External Border Gateway Protocol (EBGP) :...
EBGP会修改路由的next-hop,再转发;而IBGP默认不会修改next-hop,直接将路由转发。举个例子:R4有一条路由要发出,路由传递到R2,R5,路由的下一跳(next-hop)是R4。 R2通过EBGP将路由传输到R1,由于是EBGP,所以路由的next-hop改为R2。 R1再通过EBGP将路由传递给R3,由于是EBGP,路由的next-hop被改为R1。到此为止,R...
iBGP vs eBGP: 1. iBGP通告local-prefence;eBGP不能; 2. iBGP不修改下一跳和AS_PATH,而eBGP可以; 3. iBGP有前缀同步要求(前缀需要在IGP存在才被广播,而且如果IGP是OSPF的话,还需要路由器ID吻合;eBGP没有前缀同步要求; *如果此AS不是穿越AS,或是穿越AS但穿越路径上都运行了BGP,前缀同步可以关掉; ...
BGP behaves differently depending of the type of peering: Internal (iBGP) vs. External (eBGP). One of the many differences between these two is how the loop prevention is implemented. In the case of eBGP, the AS_PATH attribute is used and appended to all the updates sent out outside the...
I understand why iBGP peering is needed between AS internal routers and the border router running eBGP with another AS. That is, iBGP by definition will not propagate routes learned from an iBGP neighbor. So in the top diagram in the image, a route learned by router B from AS 65101 will...
unchanged Use unchanged address (for eBGP session only) verify-availability Verify the reachability of the tracked object R2(config-route-map)#set ip next-hop redist-unchanged Theroute-mapREDIST-UNCHANGED is applied as a parameter for theredistributeconfiguration statement in BGP...
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