cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
2574
Views
0
Helpful
7
Replies
Highlighted
Enthusiast

EIGRP passive interface Nexus 7k

There are some interfaces on the 7k, 6.2(8b). that are configured as passive, ip passive-interface eigrp 100, and those networks are not being advertised via eigrp.  It's my understanding that the passive command stops neighbor relationships from forming, but will continue to advertise the connected networks.  This appears to be the case with Nexus as it is with IOS.  

From

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/4_2/nx-os/unicast/configuration/guide/l3_cli_nxos/l3_eigrp.pdf

"Configuring a Passive Interface for EIGRP You can configure a passive interface for EIGRP.

A passive interface does not participate in EIGRP adjacency but the network address for the interfacee remains in the EIGRP topology table."

What am I missing?  

thank you, 

Bill

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted
Hall of Fame Guru

Not used Nexus but as far as

Not used Nexus but as far as I am aware you still need to enable EIGRP under the interface.

So using your example above -

int vlan 3
ip router eigrp 10
ip passive-interface eigrp 10

ie. you need to run EIGRP on the interface but then make it passive with the additional command.

Just using the passive-interface command on it's own does not mean EIGRP runs on that interface.

Like I say not used Nexus but it seems the most logical explanation.

Jon

View solution in original post

7 REPLIES 7
Highlighted
Hall of Fame Expert

Your understanding is correct

Your understanding is correct. The behavior is the same for both IOS and Nexus OS.

Can you post relevant configs?

Highlighted
Enthusiast

!Command: show running-config


!Command: show running-config interface Vlan3
!Time: Sat Jan  2 09:06:05 2016

version 6.2(8b)

interface Vlan3
    no shutdown
  ip address 10.13.2.1/24
  ip passive-interface eigrp 10
  ip wccp 80 redirect in


ASC7010-ASC7010-prod# sh ip eigrp neighbors
IP-EIGRP neighbors for process 10 VRF default
H   Address                 Interface       Hold  Uptime  SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
1   10.8.63.250             Po60            10   4w0d      4    50    0   252652

ASC7010-ASC7010-prod# sh ip eigrp topology 10.13.2.0 255.255.255.0

% IP-EIGRP (AS 10): Route not in topology table

ASC7010-ASC7010-prod# sh run | sec router

.....

router eigrp 10
  distance 205 15
  default-metric 1000000 100 255 1 1500
  redistribute static route-map STATIC-TO-EIGRP


On the adjacent eigrp neigbor 10.8.63.250

ASC-DMVPN-Inet#sh ip route 10.13.2.0
% Subnet not in table

Highlighted
Hall of Fame Guru

Not used Nexus but as far as

Not used Nexus but as far as I am aware you still need to enable EIGRP under the interface.

So using your example above -

int vlan 3
ip router eigrp 10
ip passive-interface eigrp 10

ie. you need to run EIGRP on the interface but then make it passive with the additional command.

Just using the passive-interface command on it's own does not mean EIGRP runs on that interface.

Like I say not used Nexus but it seems the most logical explanation.

Jon

View solution in original post

Highlighted
Enthusiast

I was tracking that same sort

I was tracking that same sort of rationale, but messed up the command and thought it wasn't available. 


ASC7010-ASC7010-prod(config-if)# ip eigrp 10 ?
  shutdown  Shutdown EIGRP on this interface

ASC7010-ASC7010-prod(config-if)# ip eigrp 10
                                             ^
% Incomplete command at '^' marker.

It's

interface Vlan44
  no shutdown
  ip address 10.13.8.1/24
  ip router eigrp 10
  ip passive-interface eigrp 10

and that does in fact do the trick.  Thanks Jon.

Highlighted
Frequent Contributor

Hi Bill,

Hi Bill,

Your not missing anything!

say on the 7k you had an interface with an address of 10.10.10.1/30 then the 10.10.10.0/30 address would be advertised by  EIGRP on the 7k, but any networks on the other end of the link would not.

Highlighted
Enthusiast

Thanks Richard.  It's odd,

Thanks Richard.  It's odd, all the interfaces configured with passive are not in the topology, but sure enough all those with the router eigrp show up.

interface Vlan6
  ip address 10.13.4.1/24
  ip router eigrp 10
  ip wccp 80 redirect in
    no shutdown

ASC7010-ASC7010-prod# sh ip eigrp topology 10.13.4.0 255.255.255.0

IP-EIGRP (AS 10): Topology entry for 10.13.4.0/24
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2816
  Routing Descriptor Blocks:
  0.0.0.0 (Vlan6), from Connected, Send flag is 0x0
      Composite metric is (2816/0), Route is Internal
      Vector metric:
        Minimum bandwidth is 1000000 Kbit
        Total delay is 10 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 0
        Internal tag is 0

Highlighted
Participant

Hi

Hi

Firstly, did you advertise this network using the network or redistribute command?

Thanks

Content for Community-Ad