The first sign your internet is down is usually an error message from your browser, apps, smart TV, or smart speaker. The following steps will help you figure out whether the problem is your device, your home setup, or a widespread AT&T internet outage. Step 1: See if you can get onli...
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ATT(Attached):区域关联位。 由Level-1-2路由器产生,用来指明始发路由器是否与其它区域相连。当L1区域中的路由器收到Level-1-2路由器发送的ATT位被置位的L1 LSP后,它将创建一条指向Level-1-2路由器的缺省路由,以便数据可以被路由到其他区域。 虽然ATT位同时在L1 LSP和L2 LSP中进行了定义,但是它只会在L1 L...
ATT: Attached bit It is generated by a Level-1-2 router to indicate whether the originating router is connected to other areas. When a Level-1 router receives a Level-1 LSP with the ATT bit set from a Level-1-2 router, the Level-1 router creates a default route to the Level-1-2...
当一台Level-1-2路由器与其他区域相连时,路由器将通过在它的LSP中设置ATT位为1来通告这种情况,对于Level-1路由器,路由计算过程将选择开销最小的Level-1-2路由器作为它区域间的中介路由器。 IS-IS路由信息控制 在实际应用中,IS-IS协议根据SPF算法计算出来的路由有时并不能满足运营商所有需要,可能出现如下弊端:...
ATT/P/OL ATT: attach bit; P: partition bit; OL: overload bit. SOURCE System ID of the source node. NLPID Network protocol supported. AREA ADDR Area address. INTF ADDR Interface address. NBR ID System ID of a neighbor. IP-Internal IPv4 route information in a domain. +SRLG NBR ID ID...
ATT字段：当Level-1-2 IS-IS在Level-1区域内传送Level-1 LSP时，如果Level-1 LSP中设置了ATT位，则表示该区域中的Level-1 IS-IS可以通过此Level-1-2 IS-IS通往外部区域。OL（LSDB Overload）字段：过载标志位。设置了过载标志位的LSP虽然还会在网络中扩散，但是在计算通过过载路由器的路由时不会被采用。即...
ATT连接位由L1/L2路由器产生,但仅与L1 LSP有关,表示产生此LSP的路由器(L1/L2路由器)与多个区域相连接。 1. 配置IS-IS不采用ATT位计算缺省路由 表1-36 配置IS-IS不采用ATT位计算缺省路由 操作 命令 说明 进入系统视图 system-view - 进入IS-IS视图 isis [ process-id ] [ vpn-instance vpn-instance...
ATT字段:当Level-1-2 IS-IS在Level-1区域内传送Level-1 LSP时,如果Level-1 LSP中设置了ATT位,则表示该区域中的Level-1 IS-IS可以通过此Level-1-2 IS-IS通往外部区域。 OL(LSDB Overload)字段:过载标志位。设置了过载标志位的LSP虽然还会在网络中扩散,但是在计算通过过载路由器的路由时不会被采用。即对路...