On Monday, January 21, 2013 09:31:02 PM David Barak wrote: > There are most certainly those of us who do make use of > the L1/L2 injection of the default route via ATT bit in > ISIS networks today. It's an extremely useful way to > keep a L2 database down in size when you don't need to > have many areas.
The problem comes in when you have other protocols on the router that require the specific /32 (IPv4) or /128 (IPv6). Otherwise, yes, the Attached Bit does have use-cases, as it was designed for. The theory is that L1/L2 routers know how to get to the L2 domain, where all knowledge about the network presumably lies. In our case, that is quite a thumb- suck :-). Mark.
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