【正文】
? 為了防止一臺 PE接收到遠(yuǎn)端 PE發(fā)給本地不同 VRF的相同地址的主機時不知所措,而加在報文前面的特殊信息 本資料由 大學(xué)生創(chuàng)業(yè) |創(chuàng)業(yè) |創(chuàng)業(yè)網(wǎng) 在線代理 |網(wǎng)頁代理 |代理網(wǎng)頁 | 減肥藥排行榜 |淘寶最好的減肥藥 |什么減肥藥效果最好 |減肥瘦身藥 | MPLS VPNS AND PACKET FORWARDING The PE routers will label the VPN packets with a label stack, as follows: ? Using the LDP label for the egress PE router as the top label ? Using the VPN label assigned by the egress PE router as the second label in the stack 本資料由 大學(xué)生創(chuàng)業(yè) |創(chuàng)業(yè) |創(chuàng)業(yè)網(wǎng) 在線代理 |網(wǎng)頁代理 |代理網(wǎng)頁 | 減肥藥排行榜 |淘寶最好的減肥藥 |什么減肥藥效果最好 |減肥瘦身藥 | VPN PHP ? PHP on the LDP label can be performed on the last P router. ? The egress PE router performs label lookup only on the VPN label, resulting in faster and simpler label lookup. ? IP lookup is performed only once— in the ingress PE router. 本資料由 大學(xué)生創(chuàng)業(yè) |創(chuàng)業(yè) |創(chuàng)業(yè)網(wǎng) 在線代理 |網(wǎng)頁代理 |代理網(wǎng)頁 | 減肥藥排行榜 |淘寶最好的減肥藥 |什么減肥藥效果最好 |減肥瘦身藥 | 。這會導(dǎo)致轉(zhuǎn)發(fā)效率的降低。 CE不知道使用的是 VPNIPv4地址 ? 穿越供應(yīng)商骨干時,在 VPN數(shù)據(jù)流量的包頭中,是沒有攜帶 VPNIPv4地址 ROUTE DISTINGUISHERS (CONT.) ROUTE DISTINGUISHERS (CONT.) ROUTE DISTINGUISHERS (CONT.) EndtoEnd Routing Information Flow MPLS VPN ROUTING REQUIREMENTS ?CE routers have to run standard IP routing software. ?PE routers have to support MPLS VPN services and Inter routing. ?P routers have no VPN routes. MPLS VPN ROUTING LABEL MPLS VPNs and Packet Forwarding MPLS VPNS AND PACKET FORWARDING ? 由于公網(wǎng)的隧道已經(jīng)由 MPLS來提供,而且 MPLS支持多層標(biāo)簽的嵌套,這個標(biāo)記定義成 MPLS標(biāo)簽的格式。 ? The 64bit RD is prepended to an IPv4 address to make it globally unique. ? 在 IPv4地址加上 RD之后,就變成 VPNIPv4地址族了 ? VPNv4 addresses are exchanged between PE routers via BGP. ? BGP that supports address f