09-06-2021 06:23 PM
Hi, I was just wondering, if I am configuring EIGRP on Layer 3 switches and I want to make passive interfaces for my exit interfaces to my Private Network(Layer 2 Switches). Am I able to add interfaces which I have configured as Etherchannels to the passive interfaces?
09-06-2021 11:29 PM
Hello,
do you have a layer 3 port channel to your home network ? Hello packets are sent on layer 3 interfaces only as far as I recall. If the port channel is L3, you can make it passive.
09-07-2021 12:09 AM
Thank you @Georg Pauwen for your response
09-06-2021 11:40 PM
Hello @Kwaku Paintsil ,
only the port-channel interface if configured for L3 operation
like
int port-channel 1
no switchport
ip address 10.10.10.1 255.255.255.0
in this case the port-channel 1 can be made passive under the router eigrp configuration you don't need to configure passive for the member links. From the point of view of EIGRP / IP routing the port-channel is a single logical link.
if your port channel is configured as a L2 802.1Q trunk carrying several VLANs it is like it does not exist for EIGRP and you should passive the SVI interfaces of user facing VLANs.
Hope to help
Giuseppe
09-07-2021 12:11 AM
Thank you @Giuseppe Larosa yes my port channel has been configured as a trunk for carrying vlans. This being the case I will configure the SVI interfaces of the user facing the vlans.
09-07-2021 04:47 AM
Hello @Kwaku Paintsil ,
your understanding is correct being the port-channel a L2 trunk the EIGRP passive interface can be configured for each SVI associated to each VLAN allowed on the trunk where only end user devices are connected.
Hope to help
Giuseppe
09-07-2021 12:26 AM
If this is Layer 2 Port-channel you not required to do, you need to only do passive-interface on Layer 3 SVI which is passing inside Port-channel.
09-07-2021 03:09 AM
Hello
@Kwaku Paintsil wrote:
Hi, I was just wondering, if I am configuring EIGRP on Layer 3 switches and I want to make passive interfaces for my exit interfaces to my Private Network(Layer 2 Switches).
EIGRP is a Layer 3 routing protocol so it wont run on layer 2 switch interconnected trunks, So if your portchannels connectiing to your lan switches are all layer 2 then eigrp and passive interfaces are not applicable.
09-07-2021 08:37 AM
Although already correctly answered by the other posters, just to be clear, you would only have a "passive" EIGRP setting for the interface with an IP. Shouldn't matter what the underlying "physical" interface(s) is/are.
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