Having another wonderfull night listening to the hum of 10 routers. Here's the deal.
router5 ----ebgp--- router3 ----- ospf area 0 ----- r1 Router 5 is generating a couple of external networks via the loopback. Namely 172.16.0.0/24, 10.0.0.0/24, 192.168.1.0/24, 69.69.0.0/16, and is also sending in a 0.0.0.0/0 default. On r3, i'm also using a "default-information originate" in order for the ospf speaks behind r1 to get the default. Everything was running fine and I started filtering with OSPF tags. The one thing that I noticed on r1 (see below) is that the 0.0.0.0/0 had already had a tag of "1" so when I started filtering things broke because I assumed that it would have a tag of 0 (like all the other ospf routes prior to modification/redistro) The next odd thing was that the routes that r3 was receving from BGP were getting redistributed into OSPF (i know, i know, bad design) but the weird part is that on r1 they were showing with a tag as 11 (which is the as that r5 is in) Below is a "sh ip ospf d" on r1. Does this look normal? All of the ebgp learned routes sent to r3 from r5 have an ospf tag of 11? r1#sh ip ospf d OSPF Router with ID (141.108.255.5) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 141.108.3.1 141.108.3.1 1247 0x80000003 0x747B 2 141.108.4.1 141.108.4.1 607 0x80000005 0xF601 1 141.108.255.5 141.108.255.5 1284 0x80000003 0x9888 3 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 141.108.255.1 141.108.255.5 1284 0x80000002 0xA1A2 141.108.255.5 141.108.255.5 1284 0x80000002 0x6CD4 Summary Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 141.108.4.0 141.108.4.1 1435 0x80000002 0x4607 Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 0.0.0.0 141.108.4.1 425 0x80000001 0xBBF7 1 10.10.10.0 141.108.4.1 581 0x80000001 0x784 11 16.16.16.0 141.108.255.5 1532 0x80000002 0xB1CB 0 69.69.0.0 141.108.4.1 582 0x80000001 0xAC72 11 141.108.1.0 141.108.255.5 1532 0x80000002 0x1A8B 0 141.108.2.0 141.108.255.5 1532 0x80000002 0xAA04 0 141.108.3.0 141.108.255.5 1285 0x80000002 0x9F0E 0 141.108.4.0 141.108.255.5 1285 0x80000002 0x9418 0 141.108.255.0 141.108.255.5 1532 0x80000002 0xC0EF 0 150.150.0.0 141.108.255.5 1532 0x80000002 0xB5BD 0 172.16.1.0 141.108.4.1 582 0x80000001 0xDF0C 11 192.168.1.0 141.108.4.1 582 0x80000001 0xB38B 11 r1# Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=49226&t=49226 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]