中國電信cn2網(wǎng)絡(luò)介紹(文件)
【正文】 LAs via Zero Loss amp。 Core Aggregation Edge Service 高速轉(zhuǎn)發(fā)層 業(yè)務(wù)接入層 SR/PE SR/PE SR/PE Simple Network Topology(cont) IP/MPLS Network AllOptical， Dense Wave Division Multiplexing (DWDM) SONET/SDH framing Per flow loadsharing and fail over loadsharing with ISIS MPLS is enabled with traffic to the PE Loopback is tagged. Hence, only VPN traffic is encapsulated in MPLS, all others is transported native IP MPLS SONET FRAMING DWDM IP IP Scalable route architecture To ensure work’s scalability and security, only infrastructure address blocks are redistributed into the ISIS (IGP) routing table. Noninfrastructure addresses are redistributed in BGP. Keeping the ISIS routing table to a minimum would greatly enhance the work stability. 只有中繼鏈路地址和管理地址通過 ISIS,其他路由通過 BGP,控制 IGP路由表的條目 ,保證網(wǎng)絡(luò)設(shè)備和鏈路數(shù)量的擴(kuò)展性 . Single Global ASN (AS4809), CN2 have two type Route reflector VPN RR for RFC2547based VPN service,(VRR) Global RR for inter service(GRR) VPN RR is independent of global RR, both use one level Route Reflector(RR) (VRR和 GRR是獨立設(shè)置的 ,各自專用的 ) BGP Communities are deployed for routes control and flowbased traffic monitor Global iBGP: Scaling the Global Inter Routing Table involve the increase in the number of GRR group. 通過增加并列的 GRR組來分擔(dān)部分 public 路由處理 ,這樣具有很大的擴(kuò)展性 . VPN iBGP: Likewise, scaling the VPN routing Table involve the increase of VRR group. Example, VPN1500 is handled by VRRG1 while VPN5011000 can be handled by VRRG2 通過增加并列的 VRR組來分擔(dān)部分 VPN路由表的處理 ,比如 VPN1500的路由表有 G1轉(zhuǎn)發(fā) ,VPN5011000通過 G2轉(zhuǎn)發(fā) . 通過以上兩種設(shè)計解決網(wǎng)絡(luò)路由表的擴(kuò)展性 . Scalable route architecture (Cont) Full mesh Peers Full mesh Peers Inter GRR1 GRR2 GRR3 GRR4 Client Client Client Client Group 1 for part1 routes Group 2 for Part2 routes Inter Send Part 2 routes to G2 Send Part 1 routes to G1 Receive Part 1 routes from G1 Receive Part 2 routes from G2 EBGP EBGP iBGP architecture for global routes Scalable route architecture (Cont) Full mesh Peers Full mesh Peers VRR1 VRR2 VRR3 VRR4 Client Client Client Client Group 1 for VPN 1500 routes Send/ receive VPN1 routes to/from G1 PE PE PE PE Group 2 for VPN 5011000 routes Send/ receive VPN501 routes to/from G2 iBGP architecture for VPN routes Highest Level of redundancy All work links are deployed in pairs over diverse facilities Only POS interface are used on backbone interconnection to facilitate faster failures detection All work links are active (NOT working and protect) Each PoP’s router pair is connec
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1