JMHO - comment below:
""richard dumoulin"" wrote in message news:[EMAIL PROTECTED]... > Priscilla, > > Do you remember the discussion about IP unnumbered ? Sure you do. You wrote > "Now, network management is a concern, however. If your serial interface is > unnumbered, you can't ping it or send it SNMP messages. With those > functions, the serial port acts as an end host and must have a network-layer > address. That's the tradeoff". > > I have found in Cisco ISP essentials book, the following: "Many ISPs use > monitoring systems that use ping to check the status of the leased line. > Even if the customer unplugs the LAN, an alarm will not be raised on the > ISPs management system. This is because the customer router still knows > that the LAN IP address is configured on the system and is "useable" ". > (page 46) CL: sure, but only if the links are numbered. many ISP's use unnumbered and static routes as well. Monitoring is done through other means, either using things like telco tools or CDP and Cisco Works. CDP requires no L3 info to check neighbor health. Way back when, my link to UUNet was unnumbered, but I sure saw their router when I did a "show CDP nei" CL: the other thing to question is both the contexrt of the statement, or the accuracy. sometimes some of the books out there will contain statements which are accurate in some cases, but not accurate and therefore not useful to make blanket conclusions. when the book says "ping" are you sure that they are referring to "IP ICMP ping"? Telco's monitor their links all the time, using L2 and L1 tools. Keepalives, etc. I can call the process "ping" if I want, if only to put it into an understandable ( for me ) context, but that does not mean that it is "ping" in the IP sense of the word. CL: what I do know is that it is very difficult to ping a device that has no IP number assigned to it. not using ICMP. > Regards. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=49357&t=49347 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
