Type 5 LSA's flood ospf domain wide and are not processed by ABR's. The only opportunity to summarize or otherwise modify them is at the point of injection into the OSPF domain (which by definition occurs on an ASBR) The only small exception to this is for type 7 to type 5 conversions which can be summarized or filtered by the NSSA ABR that performs the translation from 7 to 5.
At 03:39 PM 8/1/2002 +0000, Jason Greenberg wrote: >No, I just tested this and summary-address on the ABR did not summarize >the external LSAs, because the redistribution did not occur on the ABR. > >On Thu, 2002-08-01 at 10:10, Mark Turpin wrote: > > I'm just going to assume you're running standard areas everywhere. > > > > While it is supposedly possible to summarize on the ABR with > > summary-address, > > I prefer to use summary-address on the ASBR that is doing the > > redistribution. > > > > area range is used for summarizing that area's networks into the backbone > > area as such: > > area4_abr(config-router)#area 0 range 192.168.0.0 255.255.255.0 > > (summarizes from area4 into area0) > > > > foo_abr(config-router)#area foo range 192.168.0.0 255.255.255.0 > > will summarize 192.168.0.0/24 into area 'foo' > > > > hth, > > -Mark > > > > ""Jay Greenberg"" wrote in message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > Hello group, > > > > > > I seem to have a problem with OSPF external LSA summarization. I have > > > an Ethernet segment in area 4. There are 2 ASBRs (RAS Gear), and 1 ABR > > > (the router connected to my backbone). Suppose for now, that ASBR1 is > > > injecting 192.168.0.1/32 into OSPF as an E2 LSA, and ASBR2 is injecting > > > 192.168.0.128/25 into OSPF as an E2 LSA. I would like the other areas > > > to just understand that 192.168.0.0/24 is reachable via the area 4 ABR, > > > however, #area 4 range 192.168.0.0 255.255.255.0 will not work, because > > > it will not summarize external routes, and I cannot use summary-address > > > (or can I?) on the ABR, because it is only supposed to be used by > > > ASBRs. > > > > > > My question is: How can I get the ABR to summarise the /24? > > > > > > Jay Greenberg >-- >Jason Greenberg, CCNP >Network Administrator >Execulink, Inc. >[EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=50425&t=50260 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
