【正文】 持OSPF/ISIS/BGP GR (Graceful Restart)支持等價(jià)路由支持策略路由支持路由策略組播支持IGMP 支持IGMP Snooping支持IGMP Filter支持IGMP Fast leave支持IGMP Proxy支持PIMSM支持PIMDM支持MSDP支持MBGP支持AnyRPACL/QoS支持標(biāo)準(zhǔn)和擴(kuò)展ACL支持基于VLAN的ACL支持自反ACL支持Diffserv/QoS支持流量監(jiān)管（CAR），粒度為8Kbps支持流量整形（Traffic Shapping）支持優(yōu)先級(jí)Mark/Remark支持隊(duì)列調(diào)度機(jī)制，包括SP、WRR、SP+WRR支持擁塞避免機(jī)制，包括TailDrop、WRED支持BT限流VPN支持MPLS L3 VPN支持MPLS L2 VPN，包括martini、kompella兩種方式支持VPLS，包括BGP、LDP兩種方式支持IPSec VPN支持L2TP支持GRE支持DVPN安全機(jī)制支持IEEE SERVER支持Portal認(rèn)證支持AAA/Radius支持HWTACACS支持SSHv2支持ACL流過(guò)濾機(jī)制支持OSPF、RIPv2 及BGPv4 報(bào)文的明文及MD5密文認(rèn)證支持安全網(wǎng)管SNMPv3支持命令行采用分級(jí)保護(hù)方式，防止未授權(quán)用戶的非法侵入，為不同級(jí)別的用戶有不同的配置權(quán)限支持受限IP地址的Telnet登錄和口令機(jī)制支持IP地址、VLAN ID、MAC地址和端口等多種組合綁定支持URPF支持廣播報(bào)文抑制支持主備數(shù)據(jù)備份機(jī)制支持故障后報(bào)警和自恢復(fù)支持?jǐn)?shù)據(jù)日志防火墻支持嵌入式硬件加速防火墻支持虛擬系統(tǒng)防火墻，虛擬系統(tǒng)防火墻之間通過(guò)VLAN劃分支持包過(guò)濾技術(shù)支持應(yīng)用層報(bào)文過(guò)濾ASPF支持多種攻擊防范技術(shù)支持智能防范蠕蟲(chóng)病毒技術(shù)支持透明防火墻支持郵件過(guò)濾支持網(wǎng)頁(yè)過(guò)濾支持日志功能支持各種事件監(jiān)控和統(tǒng)計(jì)功能支持NAT功能NAT支持NAT/NAPT模式支持NAPT模式支持VPN多實(shí)例NAT支持Multi ISPPOE支持Power Over Ethernet功能系統(tǒng)管理支持FTP、TFTP、Xmodem支持SNMP V1/V2/V3支持RMON支持NTP時(shí)鐘支持HGMP 支持多種配置方式IPV6支持RIPng支持OSPF v3支持ISIS v6支持BGP4+ for IPv6支持MLD v1amp。n 電信級(jí)可靠性設(shè)計(jì)S8500采用分布式結(jié)構(gòu)，支持雙主控交換板，無(wú)源背板設(shè)計(jì)，所有單板支持熱插拔；電源系統(tǒng)采用1+1冗余熱備份，并支持雙路電源輸入；風(fēng)扇冗余設(shè)計(jì)并支持自動(dòng)調(diào)速；支持STP/RSTP/MSTP、RPR、RRPP、VRRP、SmartLink協(xié)議；提供不間斷路由轉(zhuǎn)發(fā)功能，能夠滿足電信級(jí)網(wǎng)絡(luò)高可靠性要求，％。S8500支持策略QinQ功能，可以根據(jù)豐富的流分類(lèi)策略，包括VLAN tag、MAC地址、IP協(xié)議、源地址、目的地址、優(yōu)先級(jí)、或端口號(hào)等，靈活標(biāo)記外層VLAN tag，彌補(bǔ)了傳統(tǒng)靈活QinQ的不足，更好地滿足了城域接入網(wǎng)不同業(yè)務(wù)分類(lèi)和分流的建設(shè)需求。S8500采用的最長(zhǎng)匹配、逐包轉(zhuǎn)發(fā)方式，能夠有效地抗擊網(wǎng)絡(luò)“紅色代碼”、“沖擊波”等病毒的攻擊，更加適合大規(guī)模、多業(yè)務(wù)，復(fù)雜流量訪問(wèn)的網(wǎng)絡(luò)。 S8508產(chǎn)品外觀圖產(chǎn)品特點(diǎn)n 大容量、高密度線速交換S8500采用全分布式體系結(jié)構(gòu)設(shè)計(jì)，通過(guò)最長(zhǎng)路由匹配和Crossbar技術(shù)進(jìn)行高速報(bào)文交換，從而大大提升了路由交換機(jī)的轉(zhuǎn)發(fā)性能和擴(kuò)展能力。所以整體采用S8500作為網(wǎng)絡(luò)骨干設(shè)備.Quidway174。該網(wǎng)絡(luò)與外界網(wǎng)絡(luò)接口很少,因此路由學(xué)習(xí)條目有限,S8500支持路由條目256K,完全勝任路由學(xué)習(xí)要求。配置接入層交換機(jī)50臺(tái)，要求有2個(gè)千兆光口，24個(gè)10/100M電口，選配S2403HHI配置20個(gè)中距光模塊。設(shè)備具備如下接口：業(yè)務(wù)板卡：24個(gè)千兆光口（單板卡）二塊，配40個(gè)中距光模塊，配1個(gè)長(zhǎng)距光模塊；48個(gè)千兆電口（單板卡）。n 業(yè)務(wù)系統(tǒng)的安全保障 。 安全控制n 提供對(duì)用戶STB接入的認(rèn)證：PPPoE＋、DHCP＋。n 頻道業(yè)務(wù)的可控管理和運(yùn)營(yíng)：可控組播,IGMP fliter/Snooping 。 組播支持n 組播協(xié)議支持：PIMSM＋MBGP＋MSDP，IGMP。n 頻道快速切換。 QoS保證n 延遲、抖動(dòng)、丟包率。n 骨干網(wǎng)提供足夠的帶寬承載IPTV業(yè)務(wù)。The creation of setting can be a magical fictional gift in a3 承載網(wǎng)整體方案建議216。The setting of a novel is not always drawn from a reallife locale. Literary artists sometimes prefer to create the totality of their fiction—the setting as well as characters and their actions.A regional writer usually sets his/her stories in one geographic area and tries to bring it alive to readers everywhere. Thomas Hardy, in his portrayal of life in Wessex, wrote regional novels. Arnold Bennett’s novels of the “Five Towns” are markedly regional. Willliam Faulkner, known as a distinguished regional writer, almost always set his novels and stories in his native Mississippi.2. Local color writing /regionalism and the writer, a regional writer.In addition to place, setting may crucially involve the time of the story—century, year, or even specific hour. It may matter greatly that a story takes places in the morning or at noon. The medieval background informs us differently from the twentieth century. Kennedy and Gioia note that in The Scarlet Letter, the nineteenthcentury author Nathaniel Hawthrone, utilizes a long introduction and a vivid description of the scene at a prison door to inform us that the events in the story took place in the Puritan munity of Boston of the earlier seventeenth century. This setting, to which Hawthorne pays so much attention, together with our schemata concerning Puritan practice, helps us understand what happens in the novel. We can understand to some extent the agitation in the town when a woman is accused of adultery, for adultery was a flagrant defiance of church for the Godfearing New England Puritan munity, and an illegitimate child was evidence of sin. Without information about the seventeenthcentury Puritan background, a reader today may be perplexed at the novel. The fact that the story in Hawthorne’s novel took place in a time remote from our own leads us to expect different attitudes and customs of the characters, is strongly suggestive of the whole society, which is crucial to an essential understanding of The Scarlet Letter as a whole.Before this ugly edifice, and between it and the wheeltrack of the street, was a grassplot, much overgrown with burdock, pigweed, appleperu, and such unsightly vegetation, which evidently found something congenial in the soil that had so early borne the black flower of civilized society, a prison. But, on one side of the portal, and rooted almost at the threshold, was a wild rosebush, covered, in this month of June, with its delicate gems, which might be imagined to offer their fragrance and fragile beauty to the prisoner as he went in, and to the condemned criminal as he came forth to his doom, in token that the deep heart of Nature could pity and be kind to him. as an environment, it absorbs some and repels others of the characters: those who are absorbed achieve a somber integration with it, but those who are repelled and rebel suffer disaster. his contemporary Evelyn Waugh stated that the West Africa of that book replaced the true remembered West Africa of his own experience. Such power is not unmon: the Yorkshire moors have been romanticized because Emily Bronte wrote of them in Wuthering Heights, and literary tourists have visited StokeonTrent in northern England because it prises the “Five Towns” of Arnold Bennet’s novels of the early twentieth century. Thus, a reader’s reaction to a place is not merely based upon the way it looks, but upon the potentialities of action suggested by it. Places matter greatly to many writers. For instance, the French novelist Balzac, before writing a story set in a town, he would go and visit that town, select a few lanes and houses, and describes them in detail, down to their very smells. In his view the place in which an event occurs was of equal moment with the event itself, and it has a part to play. Another example is Thomas Hardy, under whom the presentation of sett