EIGRP question

[Rafael Mendes]

Hello Guys,

I've a question about EIGRP.

I've the topology attached in my environment(just a example), where i have three routers(sometimes two) with HSRP and EIGRP, each router has an ISP connected to the destination, so, we use the HSRP to have hight availability of gateway and EIGRP to route the traffic.

The question is about bandwdt command in EIGRP, i have the config below:

Current configuration : 1531 bytes
ip vrf TESTE_X
 rd 1:804
!
!
interface Serial0/2/3
 bandwidth 64
 ip vrf forwarding TESTE_X
 ip address X.X.X.X
 ip accounting output-packets
 ip flow monitor FLOW-MONITOR-1 sampler SAMPLER-1 output
 encapsulation ppp
 no cdp enable
!
interface Port-channel1
 no ip address
 hold-queue 150 in
!
interface Port-channel1.804
 encapsulation dot1Q 804
 ip vrf forwarding TESTE_X
 ip address 172.50.0.55 255.255.255.240
 ip accounting output-packets
 ip flow monitor FLOW-MONITOR-1 sampler SAMPLER-1 input
 standby 4 ip 172.50.0.62
 standby 4 preempt
 standby 4 authentication adm4ad
!
router eigrp 100
!
address-family ipv4 vrf TESTE_X autonomous-system 100
  redistribute static
  network 172.50.0.48 0.0.0.15
  passive-interface default
  no passive-interface Port-channel1.804
  no eigrp log-neighbor-changes
 exit-address-family
!
ip route vrf TESTE_X 0.0.0.0 0.0.0.0 172.50.0.49 name default-route-to-firewall
ip route vrf TESTE_X 172.16.254.87 255.255.255.255 10.224.240.2
ip route vrf TESTE_X 172.16.254.88 255.255.255.255 10.224.240.2
ip route vrf TESTE_X 172.16.254.180 255.255.255.255 10.224.240.2
ip route vrf TESTE_X172.16.254.184 255.255.255.255 10.224.240.2

The bandwidth of serial is wrong, currently is 64, but, i need to change to 128.

will it impact in EIGRP config? Or does not matter because this interface is a passive interface?

Thank you,

Rafael

[Peter Paluch · Accepted solution]

Hi Rafael,

According to the configuration you have posted, the IP network on the Serial0/2/3 interface is not even added to EIGRP (there is no corresponding network command in EIGRP). Therefore, to EIGRP, this interface does not even exist - EIGRP ignores it completely. Changing the bandwidth setting on this Serial interface will not affect your EIGRP in any way.

Best regards,
Peter

[Rafael Mendes]

Hi Peter,

Thank you for your reply.

Just more one question, my interface that are partiicpating in EIGRP is the interface Port-channel1.804, but, the int don't have the network command.

Look the command below:

EIGRP-IPv4 Neighbors for AS(100) VRF(TESTE_X)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   172.50.0.59             Po1.804                  12 4w3d        1   100  0  163

i'm confused...

This is because the command "no passive-interface Port-channel1.804"?

[Cisco Freak]

Hi Rafael,

You EIGRP configuration matches the IP of the Po1.804 interfaces.

router eigrp 100
!
address-family ipv4 vrf TESTE_X autonomous-system 100
  redistribute static
  network 172.50.0.48 0.0.0.15

This statement will enable EIGRP process in any interface which got IP in the range 172.50.0.48 to 172.150.0.63. Your port-channel IP falls in this range. Hence it participates in EIGRP process 100.

CF

[Rafael Mendes]

Nice! Now i got it!

Thank you!