when you use LSA type 4 in OSPF environment？
正确答案:
Type 4 LSAs （ASBR Summary LSAs） are originated by Area Border Routers to describe Autonomous System Boundary Routers outside the area.
When external route is inject into the ospf domain， ASBR Summary LSA is used byABR to advertise ASBRs external to an area.
When external route is inject into the ospf domain， ASBR Summary LSA is used byABR to advertise ASBRs external to an area.
答案解析:有
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