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strange eigrp default route filtering in NX-OS

Roman Rodichev
Level 7
Level 7

I'm having a strange problem on Nexus 7000 NX-OS 5.1(2)

router eigrp 100

  address-family ipv4 unicast

    redistribute static route-map static

!

route-map block666 deny 10

  match tag 666

route-map block666 permit 20

route-map static permit 10

!

interface Ethernet1/4

  ip address 172.16.129.21/30

  ip router eigrp 100

  ip distribute-list eigrp 100 route-map block666 out

  no shutdown

!
ip route 0.0.0.0/0 172.16.66.34
KKA7K-A# show ip eigrp topology 0.0.0.0/0
IP-EIGRP (AS 100): Topology entry for 0.0.0.0/0
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 51200
  Routing Descriptor Blocks:
  0.0.0.0, from Rstatic, Send flag is 0x0
      Composite metric is (51200/0), Route is External
      Vector metric:
        Minimum bandwidth is 100000 Kbit
        Total delay is 1000 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1492
        Hop count is 0
      External data:
        Originating router is 172.16.0.1 (this system)
        AS number of route is 0
        External protocol is Static, external metric is 0
        Administrator tag is 0 (0x00000000)
  172.16.64.4 (Vlan64), from 172.16.64.4, Send flag is 0x0
      Composite metric is (15360256/15360000), Route is External
      Vector metric:
        Minimum bandwidth is 1000 Kbit
        Total delay is 500010 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1
      External data:
        Originating router is 172.16.129.13 
        AS number of route is 0
        External protocol is Static, external metric is 0
        Administrator tag is 0 (0x00000000)
        Exterior flag is set
  172.16.64.11 (Vlan64), from 172.16.64.11, Send flag is 0x0
      Composite metric is (51456/51200), Route is External
      Vector metric:
        Minimum bandwidth is 100000 Kbit
        Total delay is 1010 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1492
        Hop count is 1
      External data:
        Originating router is 172.16.0.2 
        AS number of route is 0
        External protocol is Static, external metric is 0
        Administrator tag is 0 (0x00000000)
My neighbor on E1/4 is getting all routes, but for some reason it's not getting 0.0.0.0/0 default. If I remove the "  ip distribute-list eigrp 100 route-map block666 out" from the E1/4, the 0.0.0.0/0 default propagates fine. I don't see how this route-map block666 can block this 0.0.0.0/0 route, that 0.0.0.0/0 route is not tagged with 666 tag. Has anyone run into this behavior on NX-OS? I don't see any hints in the configuration guide.

1 Accepted Solution

Accepted Solutions

phiharri
Level 1
Level 1

Hi Roman,

I can see the same behaviour, it appears there is some incorrect handling of EIGRP distribute-lists for redistributed routes. Could you open a TAC Service Request so we can take a closer look? You should have a link to the right to quickly turn this thread into an SR.

Thanks,

/Phil

View solution in original post

2 Replies 2

phiharri
Level 1
Level 1

Hi Roman,

I can see the same behaviour, it appears there is some incorrect handling of EIGRP distribute-lists for redistributed routes. Could you open a TAC Service Request so we can take a closer look? You should have a link to the right to quickly turn this thread into an SR.

Thanks,

/Phil

I opened service request. Thank you for checking into it.