Hello all,
Quick question about how you would interpret a certain lab instruction.
Topology:
R6 Multilink 1 -> R9 multilink 1 (over dual serial interfaces running PPP).
The task has you add 3 new loopbacks (140.10.8.0/24, 140.10.10.0/24,
140.10.11.0/24) to R9. R6 and R9 are running EIGRP between them, and the task
wants you to configure R9 to summarise these into 140.10.8.0/22. The
restrictions are:
"Do not use distribute-filters or summary-address for this step"
Now of course "summary-address" is an OSPF command, which R6 is running, but it
explicitly says that you have to configure R9 which is NOT running OSPF.
As R9 is only running EIGRP, you'd naturally use "ip summary-address eigrp...."
on the multilink interface.
However, I took the instruction to mean you cannot use the key words
"summary-address" which of course is embedded in the EIGRP summary command.
The DSG used "ip summary-address..." however, which of course was a lot easier
than what I ended up doing:
the task never said you had to advertise the summary in EIGRP! So, with some
lateral thinking, I jumped ahead to the BGP section, used the
"aggregate-address summary-only" under BGP on R9, sent the BGP update to R6,
and redistributed the aggregate into OSPF on R6 for full reachability. Think
I'd have gotten the points?!
George.
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