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Displayed Routes in "sh ipr" different than expected based on LSDB

  • 1.  Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-14-2018 13:51
    Issue:

    Why does sh IPR treat destination networks differently even though at first glance they should be treated the same?



    Referring to this diagram: Mah-670-1 and Mah-670-2 are routers serving as the gateway between a building and the larger campus network. Dug-agg-1 and Dug-agg-2 are the aggregation routers that connect them to the OSPF area (0.0.3.2) that they all belong to.

    Mah-670-1 has an OSPF P2P link with Dug-agg-1 and with Mah-670-2.

    Mah 670-2 has an OSPF P2P link with Dug-agg-2 and with Mah-670-1.

    Dug-agg1 and Dug-agg-2 have an OSPF P2P link to each other as well as P2P links to the larger campus network. All P2P and passive VLANs are in the same VR.









    The sh ipr for mah-670-1 shows :

    #or 10.112.1.0/24 10.3.11.157 12 UG-D---um--f- CA-P2P-Dagg1 4d:22h:16m:17s

    #or 10.112.1.0/24 10.3.11.214 12 UG-D---um--f- ca-p2p-Mah-int 4d:22h:16m:17s

    #or 10.113.1.0/24 10.3.11.157 10 UG-D---um--c- CA-P2P-Dagg1 4d:22h:16m:17s

    #or 10.114.1.0/24 10.3.11.157 10 UG-D---um--c- CA-P2P-Dagg1 4d:22h:16m:17s



    All of these routes are #or

    Why then, does the 10.112.1.0/24 show two routes in the routing table (one through the Agg, one through the bld partner)

    While the 10.113 and 10.114 show only one route (through the agg)?



    Please note that both routes appear in the lsdb summary for each network.



    Sh ospf lsdb

    10.112.1.0 10.56.1.4 0x800009ed 117 0xcccd

    10.112.1.0 10.56.2.4 0x800009ef 1091 0xadeb

    10.113.1.0 10.56.1.4 0x800030d0 1437 0x7120

    10.113.1.0 10.56.2.4 0x80004add 1571 0x 267

    10.114.1.0 10.56.1.4 0x800025ed 1437 0x4c32

    10.114.1.0 10.56.2.4 0x800025f4 1571 0x373f



    The LSDB tells the router about both paths to each network.

    The IPR table chooses to show both paths for 112.1, But only one path for 113.1 and 114.1

    Why?


  • 2.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:17
    Hi Timothy,

    can you show the complete LSAs for the affected networks, please? I cannot even see of what type each LSA is from your info.

    Thanks,
    Erik


  • 3.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:17
    Erik,
    I edited the displays to show the pertinent information for the sake of brevity. the full output is included below:
    Mah-670-1.1 # vir vr-ca
    (vr VR-Campus) Mah-670-1.2 # sh ospf lsdb

    AS External LSAs
    Link State ID Adv Router Seq# Age Chksum Tag
    -------------------------------------------------------------
    0.0.0.0 10.56.240.4 0x80004d64 857 0x39a5 0
    10.12.4.0 10.255.230.4 0x80000904 1559 0x1358 0
    10.12.7.0 10.255.230.4 0x80000904 1559 0xf176 0
    10.12.9.0 10.255.230.4 0x80000904 1559 0xdb8a 0
    10.12.10.0 10.255.230.4 0x80000904 1559 0xd094 0
    10.12.13.0 10.255.230.4 0x80000904 1559 0xafb2 0
    10.12.14.0 10.255.230.4 0x80000904 1559 0xa4bc 0
    10.12.55.0 10.255.229.4 0x8000aa93 967 0x705a 0
    10.12.55.0 10.255.230.4 0x80000904 1559 0x6d8d 0
    10.12.65.0 10.255.230.4 0x800003bf 1109 0x c6c 0
    10.27.60.0 10.255.242.4 0x80004e92 990 0x138b 0
    10.91.0.0 10.92.241.4 0x80005a19 1057 0x7082 0
    10.97.1.0 10.255.241.4 0x80002308 1542 0xa190 0
    10.99.9.0 10.255.229.4 0x80002d64 1538 0x9ded 0
    129.63.40.0 10.255.242.4 0x8001cf66 990 0x2dba 0
    129.63.41.0 10.255.242.4 0x8001cf66 990 0x22c4 0
    129.63.42.0 10.255.8.4 0x8000040b 337 0x9b5e 0
    129.63.43.0 10.255.8.4 0x8000040b 337 0x9068 0
    172.31.146.0 10.11.240.4 0x800078bf 1366 0x1c10 0
    172.31.146.0 10.11.241.4 0x800078bf 1389 0x3fe8 0
    192.168.1.0 10.255.175.4 0x80007972 1140 0xfedc 0
    192.168.125.0 10.255.8.4 0x80013ae1 938 0x8ea1 0

    Router LSAs for area 0.0.3.2
    Link State ID Adv Router Seq# Age Chksum #Links
    -------------------------------------------------------------
    10.33.240.4 10.33.240.4 0x80000181 512 0xbe7f 8
    10.33.241.4 10.33.241.4 0x80000182 519 0x af7 8
    10.34.240.4 10.34.240.4 0x8000c4dc 1090 0x89b2 7
    10.34.241.4 10.34.241.4 0x8000c4dd 1063 0x640e 6
    10.38.240.4 10.38.240.4 0x800069ff 1063 0xbef2 12
    10.38.241.4 10.38.241.4 0x80006a37 1385 0xee5f 12
    10.44.240.4 10.44.240.4 0x80000339 1565 0x54c7 6
    10.44.241.4 10.44.241.4 0x80000339 1603 0x88fd 7
    10.56.1.4 10.56.1.4 0x8000dbd0 152 0x13eb 15
    10.56.2.4 10.56.2.4 0x8000e3b8 847 0x59d9 13
    10.56.220.4 10.56.220.4 0x80003e7b 630 0xa971 12
    10.56.221.4 10.56.221.4 0x80003e6e 1330 0xa945 12
    10.95.240.4 10.95.240.4 0x8000492e 615 0xeac1 8
    10.95.241.4 10.95.241.4 0x8000492c 1659 0xec06 6
    10.255.59.4 10.255.59.4 0x8000daeb 529 0x5906 18
    10.255.60.4 10.255.60.4 0x8000e412 1271 0xc338 18

    Summary LSAs for area 0.0.3.2
    Link State ID Adv Router Seq# Age Chksum
    -------------------------------------------------------------
    10.3.0.128 10.56.1.4 0x80000f53 753 0x41d8
    10.3.0.128 10.56.2.4 0x80000f57 608 0x1ef8
    10.3.0.152 10.56.1.4 0x80003163 663 0x3da0
    10.3.0.152 10.56.2.4 0x8000316f 1058 0x5a70
    10.3.0.176 10.56.1.4 0x80003162 663 0x764c
    10.3.0.176 10.56.2.4 0x80008530 1058 0xd6c8
    10.3.0.200 10.56.1.4 0x80000f60 513 0xefde
    10.3.0.200 10.56.2.4 0x80000f60 399 0xfcce
    10.3.0.224 10.56.1.4 0x80003162 663 0xa8e7
    10.3.0.224 10.56.2.4 0x8000316d 1058 0x4f3b
    10.3.0.248 10.56.1.4 0x80000f5d 213 0x2877
    10.3.0.248 10.56.2.4 0x80000f62 69 0x 398
    10.3.1.4 10.56.1.4 0x80003161 663 0x1859
    10.3.1.4 10.56.2.4 0x8000316d 1058 0xf86b
    10.3.1.32 10.56.1.4 0x8000850a 663 0xb0a7
    10.3.1.32 10.56.2.4 0x8000852c 1058 0x79b9
    10.3.1.56 10.56.1.4 0x80003163 663 0xf547
    10.3.1.56 10.56.2.4 0x8000316f 1058 0xfe2d
    10.3.1.80 10.56.1.4 0x8000bd7c 663 0x413c
    10.3.1.80 10.56.2.4 0x8000bda3 1058 0xff53
    10.3.1.104 10.56.1.4 0x80000628 1774 0x2051
    10.3.1.104 10.56.2.4 0x8000062a 968 0x2943
    10.3.1.132 10.56.1.4 0x80003162 663 0x11de
    10.3.1.132 10.56.2.4 0x8000bda1 1058 0xf927
    10.3.1.156 10.56.1.4 0x80003162 663 0x34a1
    10.3.1.156 10.56.2.4 0x8000316d 1058 0x 3c8
    10.3.1.180 10.56.1.4 0x80003163 663 0x417b
    10.3.1.180 10.56.2.4 0x8000d99c 1058 0xa538
    10.3.1.204 10.56.1.4 0x80003164 784 0x4e55
    10.3.1.204 10.56.2.4 0x8000bda0 1058 0x15c6
    10.3.1.228 10.56.1.4 0x800004b4 1144 0x4424
    10.3.1.228 10.56.2.4 0x800004b5 1508 0x2741
    10.3.2.0 10.56.1.4 0x80003163 663 0x452b
    10.3.2.0 10.56.2.4 0x8000bd9f 1058 0x c9c
    10.3.2.36 10.56.1.4 0x8000d96b 663 0xa9f5
    10.3.2.36 10.56.2.4 0x8000bda4 1058 0xc0ba
    10.3.2.84 10.56.1.4 0x80003163 663 0x e0c
    10.3.2.84 10.56.2.4 0x8000d99c 1058 0x5ede
    10.3.2.108 10.56.1.4 0x80003162 663 0x bf9
    10.3.2.108 10.56.2.4 0x8000bda4 1058 0xd95b
    10.3.2.204 10.56.1.4 0x80003162 663 0x475d
    10.3.2.204 10.56.2.4 0x80004b27 1058 0x7c46
    10.3.2.228 10.56.1.4 0x80000f5f 513 0xd6d8
    10.3.2.228 10.56.2.4 0x80000f65 429 0xc3e4
    10.3.3.64 10.56.1.4 0x80003162 663 0xcd60
    10.3.3.64 10.56.2.4 0x800058de 1058 0x5831
    10.3.3.80 10.56.1.4 0x80000f84 1414 0x4fce
    10.3.3.80 10.56.2.4 0x80000f8c 1328 0x38dc
    10.3.3.100 10.56.1.4 0x80000f85 3 0x709a
    10.3.3.100 10.56.2.4 0x8000852f 1748 0xc621
    10.3.3.124 10.56.1.4 0x80003163 1444 0x717f
    10.3.3.124 10.56.2.4 0x80000f88 1328 0x727c
    10.3.3.148 10.56.1.4 0x80003162 663 0x6e6d
    10.3.3.148 10.56.2.4 0x80004b6e 1058 0x159d
    10.3.3.176 10.56.1.4 0x80000f61 333 0xd10f
    10.3.3.176 10.56.2.4 0x80000f69 189 0xba1d
    10.3.3.196 10.56.1.4 0x80000f61 1744 0xf4d9
    10.3.3.196 10.56.2.4 0x80000f65 1598 0xf9cd
    10.3.3.220 10.56.1.4 0x80000f61 333 0x189c
    10.3.3.220 10.56.2.4 0x80000f66 219 0xf2bd
    10.3.4.64 10.56.1.4 0x80003162 663 0xae80
    10.3.4.64 10.56.2.4 0x8000b715 1058 0xc230
    10.3.4.88 10.56.1.4 0x80003162 663 0xd143
    10.3.4.88 10.56.2.4 0x8000b748 1058 0x5752
    10.3.4.112 10.56.1.4 0x80003162 663 0xe01c
    10.3.4.112 10.56.2.4 0x8000b715 1058 0xf4cb
    10.3.4.144 10.56.1.4 0x80003162 663 0x8b53
    10.3.4.144 10.56.2.4 0x800058dc 1058 0x2e0c
    10.3.4.168 10.56.1.4 0x80003162 663 0xae16
    10.3.4.168 10.56.2.4 0x800058de 1058 0x25fc
    10.3.5.52 10.56.1.4 0x80000f5e 4 0x8ad5
    10.3.5.52 10.56.2.4 0x80000f60 1659 0x93c7
    10.3.5.80 10.56.1.4 0x80000f60 364 0x81be
    10.3.5.80 10.56.2.4 0x80000f65 220 0x5cdf
    10.3.5.108 10.56.1.4 0x80000f61 4 0x66bc
    10.3.5.108 10.56.2.4 0x80000f61 1659 0x5fc2
    10.3.5.136 10.56.1.4 0x8000262a 664 0x62c6
    10.3.5.136 10.56.2.4 0x80002632 1059 0x5fbe
    10.3.5.164 10.56.1.4 0x80003162 664 0xcbfb
    10.3.5.164 10.56.2.4 0x80008351 1059 0xdbab
    10.3.5.192 10.56.1.4 0x8000262c 664 0x40ac
    10.3.5.192 10.56.2.4 0x80002633 1059 0x2bb9
    10.3.5.220 10.56.1.4 0x8000267b 664 0x740f
    10.3.5.220 10.56.2.4 0x80002685 1059 0x6d09
    10.3.5.248 10.56.1.4 0x8000267c 664 0x6df6
    10.3.5.248 10.56.2.4 0x80002686 1059 0x3e1d
    10.3.6.20 10.56.1.4 0x8000267f 664 0x4df7
    10.3.6.20 10.56.2.4 0x80002686 1059 0x3805
    10.3.6.48 10.56.1.4 0x8000011d 1535 0x545e
    10.3.6.48 10.56.2.4 0x80000f0d 1149 0x575a
    10.3.6.76 10.56.1.4 0x800001be 965 0x ce6
    10.3.6.76 10.56.2.4 0x800001be 1749 0xf003
    10.3.6.116 10.56.1.4 0x80003162 664 0x8e6a
    10.3.6.116 10.56.2.4 0x8000771f 1059 0x4fa3
    10.3.6.204 10.56.1.4 0x80003155 664 0x7136
    10.3.6.204 10.56.2.4 0x80003162 1059 0x3c5f
    10.3.6.208 10.56.1.4 0x80000f54 364 0xc5fe
    10.3.6.208 10.56.2.4 0x80000f58 190 0xa21f
    10.3.6.244 10.56.1.4 0x80003163 664 0x9bd9
    10.3.6.244 10.56.2.4 0x800078d0 1059 0xbb08
    10.3.6.248 10.56.1.4 0x80003163 664 0x73fd
    10.3.6.248 10.56.2.4 0x800078d9 1059 0x6d4b
    10.3.7.68 10.56.1.4 0x80000604 94 0xa30e
    10.3.7.68 10.56.2.4 0x80000605 1059 0xaefe
    10.3.7.96 10.56.1.4 0x80000604 244 0x9ef4
    10.3.7.96 10.56.2.4 0x80000605 1209 0x8112
    10.3.7.124 10.56.1.4 0x8000060b 94 0x77f8
    10.3.7.124 10.56.2.4 0x8000060d 1179 0x6c01
    10.3.8.0 10.56.1.4 0x80003173 1535 0xf661
    10.3.8.0 10.56.2.4 0x80005b5c 1749 0x9fa4
    10.3.8.40 10.56.1.4 0x80003162 664 0x73cf
    10.3.8.40 10.56.2.4 0x80006f3a 1059 0x1614
    10.3.8.68 10.56.1.4 0x80003162 664 0x6eb6
    10.3.8.68 10.56.2.4 0x80006f65 1059 0x9252
    10.3.8.96 10.56.1.4 0x80003162 664 0x55b3
    10.3.8.96 10.56.2.4 0x80006f3b 1059 0xe10f
    10.3.8.200 10.56.1.4 0x80003162 664 0x415f
    10.3.8.200 10.56.2.4 0x80004b62 1059 0xd7af
    10.3.9.56 10.56.1.4 0x80000903 1115 0x3b78
    10.3.9.56 10.56.2.4 0x80000905 1659 0x1c96
    10.3.9.104 10.56.1.4 0x800023e8 664 0x 386
    10.3.9.104 10.56.2.4 0x800023f1 1059 0xfd7f
    10.3.9.108 10.56.1.4 0x80003162 664 0xd12a
    10.3.9.108 10.56.2.4 0x80005a3e 1059 0x8374
    10.3.9.124 10.56.1.4 0x8000040c 334 0x5120
    10.3.9.124 10.56.2.4 0x8000040b 400 0x600f
    10.3.9.152 10.56.1.4 0x8000040b 334 0x4e06
    10.3.9.152 10.56.2.4 0x8000040c 400 0x3123
    10.3.9.180 10.56.1.4 0x8000040c 334 0x3304
    10.3.9.180 10.56.2.4 0x8000040c 400 0x2c0a
    10.3.10.44 10.56.1.4 0x80003162 664 0x49f1
    10.3.10.44 10.56.2.4 0x80004a1e 1059 0x6bfb
    10.3.10.244 10.56.1.4 0x8000040a 394 0x9564
    10.3.10.244 10.56.2.4 0x8000040b 430 0xa055
    10.3.11.16 10.56.1.4 0x8000040b 394 0x8d4d
    10.3.11.16 10.56.2.4 0x8000040c 430 0x706a
    10.3.11.44 10.56.1.4 0x8000040a 364 0x7649
    10.3.11.44 10.56.2.4 0x8000040c 430 0x6b51
    10.3.11.72 10.56.1.4 0x80001f72 514 0x27fa
    10.3.11.72 10.56.2.4 0x80001f7a 549 0x24f2
    10.3.11.100 10.56.1.4 0x800022a4 785 0xb41a
    10.3.11.100 10.56.2.4 0x800022ac 1750 0x893e
    10.3.11.128 10.56.1.4 0x80001f73 515 0x 7df
    10.3.11.128 10.56.2.4 0x80001f7c 1750 0xedee
    10.3.16.0 10.56.1.4 0x80003173 1536 0x86cd
    10.3.16.0 10.56.2.4 0x80005b5c 1750 0x2f11
    10.3.16.96 10.56.1.4 0x80003162 665 0xbc4c
    10.3.16.96 10.56.2.4 0x80004fbb 1060 0xa8e7
    10.3.16.160 10.56.1.4 0x80003166 725 0x823a
    10.3.16.160 10.56.2.4 0x80003175 790 0x4965
    10.6.0.8 10.56.1.4 0x8000040a 425 0x5d8a
    10.6.0.8 10.56.2.4 0x8000040b 461 0x40a7
    10.6.1.


  • 4.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:17
    Thanks, but I need the detailed output for just the LSAs in question. This should be possible to get using the following commands (untested, so you might need to tweak them):
    show ospf lsdb detail lsid 10.112.1.0
    show ospf lsdb detail lsid 10.113.1.0[/code]I want to check if those are of different type, e.g. one type 3 and the other type 5.


  • 5.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:17
    Understood. Here we go:

    (vr VR-Campus) Mah-670-1.3 # sh ospf lsdb det lsid 10.112.1.0

    LSAs for Area: 0.0.3.2

    LSA Type: Summary Network
    Link State Id: 10.112.1.0 (Destination Network Ip Address)
    Options: None
    Advertising Router: 10.56.1.4
    Sequence number: 0x80000a81
    Checksum: 0xa263
    Age: 392
    Length: 28
    Receive Interface: None
    Network Mask: 255.255.255.0
    Cost (TOS 0 Metric): 10

    LSA Type: Summary Network
    Link State Id: 10.112.1.0 (Destination Network Ip Address)
    Options: None
    Advertising Router: 10.56.2.4
    Sequence number: 0x80000a83
    Checksum: 0x8381
    Age: 1631
    Length: 28
    Receive Interface: None
    Network Mask: 255.255.255.0
    Cost (TOS 0 Metric): 8

    (vr VR-Campus) Mah-670-1.4 # sh ospf lsdb det lsid 10.113.1.0

    LSAs for Area: 0.0.3.2

    LSA Type: Summary Network
    Link State Id: 10.113.1.0 (Destination Network Ip Address)
    Options: None
    Advertising Router: 10.56.1.4
    Sequence number: 0x80003164
    Checksum: 0x47b5
    Age: 1762
    Length: 28
    Receive Interface: None
    Network Mask: 255.255.255.0
    Cost (TOS 0 Metric): 8

    LSA Type: Summary Network
    Link State Id: 10.113.1.0 (Destination Network Ip Address)
    Options: None
    Advertising Router: 10.56.2.4
    Sequence number: 0x80004b72
    Checksum: 0xd5fd
    Age: 361
    Length: 28
    Receive Interface: None
    Network Mask: 255.255.255.0
    Cost (TOS 0 Metric): 8

    (vr VR-Campus) Mah-670-1.5 #



  • 6.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:17
    This is the nub of my question. OSPF seems to see 10.112.1.0 and 10.113.1.0 in the same way but show iproute treats them differently.

    (vr VR-Campus) Mah-670-1.10 # sh ipr 10.112.1.0/24
    Ori Destination Gateway Mtr Flags VLAN Duration
    #or 10.112.1.0/24 10.3.11.157 12 UG-D---um--f- CA-P2P-Dagg1 8d:0h:41m:33s
    #or 10.112.1.0/24 10.3.11.214 12 UG-D---um--f- ca-p2p-Mah-int 8d:0h:41m:33s

    (mo) MOSPF (o) OSPF, (o1) OSPFExt1, (o2) OSPFExt2,
    (oa) OSPFIntra, (oe) OSPFAsExt, (or) OSPFInter, (pd) PIM-DM, (ps) PIM-SM,
    (r) RIP, (ra) RtAdvrt, (s) Static, (sv) SLB_VIP, (un) UnKnown,
    (*) Preferred unicast route (@) Preferred multicast route,
    (#) Preferred unicast and multicast route.

    Flags: (b) BFD protection requested, (B) BlackHole, (c) Compressed, (D) Dynamic,
    (f) Provided to FIB, (G) Gateway, (H) Host Route, (l) Calculated LDP LSP,
    (L) Matching LDP LSP, (m) Multicast, (p) BFD protection active, (P) LPM-routing,
    (R) Modified, (s) Static LSP, (S) Static, (t) Calculated RSVP-TE LSP,
    (T) Matching RSVP-TE LSP, (u) Unicast, (U) Up, (3) L3VPN Route.

    MPLS Label: (S) Bottom of Label Stack
    Mask distribution:
    2 routes at length 24

    Route Origin distribution:
    2 routes from OSPFInter

    Total number of routes = 2
    Total number of compressed routes = 0

    (vr VR-Campus) Mah-670-1.11 # sh ipr 10.113.1.0/24
    Ori Destination Gateway Mtr Flags VLAN Duration
    #or 10.113.1.0/24 10.3.11.157 10 UG-D---um--c- CA-P2P-Dagg1 8d:0h:41m:40s

    (mo) MOSPF (o) OSPF, (o1) OSPFExt1, (o2) OSPFExt2,
    (oa) OSPFIntra, (oe) OSPFAsExt, (or) OSPFInter, (pd) PIM-DM, (ps) PIM-SM,
    (r) RIP, (ra) RtAdvrt, (s) Static, (sv) SLB_VIP, (un) UnKnown,
    (*) Preferred unicast route (@) Preferred multicast route,
    (#) Preferred unicast and multicast route.

    Flags: (b) BFD protection requested, (B) BlackHole, (c) Compressed, (D) Dynamic,
    (f) Provided to FIB, (G) Gateway, (H) Host Route, (l) Calculated LDP LSP,
    (L) Matching LDP LSP, (m) Multicast, (p) BFD protection active, (P) LPM-routing,
    (R) Modified, (s) Static LSP, (S) Static, (t) Calculated RSVP-TE LSP,
    (T) Matching RSVP-TE LSP, (u) Unicast, (U) Up, (3) L3VPN Route.

    MPLS Label: (S) Bottom of Label Stack
    Mask distribution:
    1 routes at length 24

    Route Origin distribution:
    1 routes from OSPFInter

    Total number of routes = 1
    Total number of compressed routes = 1

    (vr VR-Campus) Mah-670-1.12 #



  • 7.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:17
    Hi,

    my original answer to the question was lost in the platform troubles. :-(

    The OSPF LSDB show differences for the prefixes 10.112.1.0/24 and 10.113.1.0/24:
    • both are known via type 3 LSA
    • the metrics from the two ABRs are different for 10.112.1.0/24, but the same for 10.113.1.0/24
    • the cost to the two ABRs should be different because of the square topology, which is confirmed by 10.112.1.0/24 showing two least cost paths and ECMP
    Thus only 10.112.1.0/24 is known via two least cost paths that can be used for ECMP, the prefix 10.113.1.0/24 has but one least cost path, so no ECMP is possible.

    Since 10.113.1.0/24 and 10.114.1.0/24 are compressed (flag c), i.e. omitted from the FIB, because a less specific prefix including both 10.113.10/24 and 10.114.1.0/24 has the exact same next hop(s), prefix 10.112.1.0/24 seems to be the outlier here.

    Thanks,
    Erik


  • 8.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:17
    Erik,
    Thanks for your time and energy on this.
    I appreciate the assist!

    Tim


  • 9.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:22
    Hi Timothy,

    Quick guess - is ECMP enabled? Looks like different link metrics and for some reason both paths to 10.112.1.0 have ultimate metrics of 12.
    It would be easier to read and troubleshoot if you pointed some breader picture (where are the networks connected) and relevant config parts.

    Regards,
    Tomasz


  • 10.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:22
    Hi Tomasz,

    EXOS shows all equal cost routes in the show iproute output, but if ECMP is not enabled, only one route is programmed into the FIB, as shown by the f flag.

    Since two routes to 10.112.1.0/24 are shown as installed into the FIB, ECMP is enabled.

    But it is a good observation that the routes towards 10.113.1.0/24 and 10.114.1.0/24 show a metric of 10, but the routes towards 10.112.1.0/24 show a metric of 12.

    @Timothy: Please provide additional information about the network topology.

    Thanks,
    Erik



  • 11.  RE: Displayed Routes in "sh ipr" different than expected based on LSDB

    Posted 09-17-2018 10:22
    Tomasz,
    ECMP is enabled

    (vr VR-Campus) Mah-670-1.4 # sh config | include iproute
    enable iproute sharing vr VR-BldgServices
    enable iproute sharing vr VR-Campus
    enable iproute sharing vr VR-HSTDSVCS
    enable iproute sharing vr VR-PCI
    enable iproute sharing vr VR-vdi
    enable iproute sharing vr VR-VoIP
    configure iproute sharing max-gateways 16

    In this particular case the VR in question is VR-Campus

    The diagram shows the two aggregtion routers at the top. These are the path back to the backbone. The two MAH routers at the bottom are the building routers for the Mahoney building. The Mahoney routers are the gateway (VRRP) routers for all of the VLANs active in the Mahoney building. The aggregation routers are the path out to all of the other buildings in area 0.0.3.2 and also to the backbone.

    The aggregation routers are the ABRs for the area. Several other buildings live in the same area. Each building has a router pair connected back to the aggregation routers in the same fashion as Mahoney. In our IP scheme the second octet is unique to a building. In the case of Mahoney 10.33.x.x are the VLANs in that building.