ACI EIGRP L3OUT Minimum bandwidth

[joeharb]

I have EIGRP established and exchanging routes between ACI and Nexus 7K's.  Everything is working but the routes learned from ACI are showing:

Minimum bandwidth is 100000 Kbit

The links between the two are 10GB, I I have tried to change EIGRP Interface policy but it doesn't seem to make any changes.  

Thanks,

Joe

[Robert Burns]

Which version of ACI are you running?  

General Tip: When posting a quesiton for help, give as much detail as possible to help us help you.  topology, outputs of interface info, SW/HW versions etc at min.

Robert

[joeharb]

 ACI version: 5.1(2e)

EIGRP established between Nexus 7K and ACI.

Pad_7K_1-Pad_7K_Core1# show interface ethernet 1/10
Ethernet1/10 is up
admin state is up, Dedicated Interface
Hardware: 1000/10000 Ethernet, address: 4055.3922.4b42 (bia 00d6.feb1.de99)
Description: *** Connection to Leaf 103 Port 48 ***
Internet Address is 10.X.X.X/30
MTU 9000 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, medium is broadcast
Port mode is routed
full-duplex, 10 Gb/s, media type is 10G

Pad_7K_1-Pad_7K_Core1# show ip eigrp topology 192.168.34.0/24

IP-EIGRP (AS 100): Topology entry for 192.168.34.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 51456
Routing Descriptor Blocks:
10.X.X.34 (Ethernet1/10), from 10.X.X.34, 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
Internal tag is 0
External data:
Originating router is 192.168.200.103
AS number of route is 0
External protocol is Static, external metric is 0
Administrator tag is 0 (0x00000000)

Thanks,

Joe

[Robert Burns]

Thanks Joe - can you give me the same interface outputs from ACI switch side.  Also include a "show lldp nei".

Robert

[Robert Burns]

Also, are you setting the bandwidth in the EIGRP interface policy by chance?

Robert

[joeharb]

Leaf103# show interface ethernet 1/48
Ethernet1/48 is up
admin state is up, Dedicated Interface
Port description is L3 OUT to 7K#1 ETH 1/10
Hardware: 100/1000/10000/25000/auto Ethernet, address: 0022.bdf8.19ff (bia 14a2.a037.fd70)
Internet Address is 10.3.26.34/30
MTU 9000 bytes, BW 10000000 Kbit, DLY 1 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, medium is broadcast
Port mode is routed
full-duplex, 10 Gb/s, media type is 10G

LLDP is not enabled on the 7K but CDP is...

Pad_7K_1-Pad_7K_Core1# show cdp neighbors interface ethernet 1/10
Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
S - Switch, H - Host, I - IGMP, r - Repeater,
V - VoIP-Phone, D - Remotely-Managed-Device,
s - Supports-STP-Dispute

Device-ID Local Intrfce Hldtme Capability Platform Port ID
Leaf103(FLM254XXXXX)
Eth1/10 155 R S s N9K-C93180YC-FX Eth1/48

I do have an eigrp policy in place but it set exactly like your screenshot with a "0" value.  I have tried to modify it but it doesn't see to make any difference.

Thanks,

Joe

[micgarc2]

Hi Joe,

So the interface policy isn't relevant here since this is an external route (assume its a BD route since it says redistributed static).That policy only will affect internal eigrp routes. If its not a BD route redistributed into EIGRP let me know and the policy will be applied somewhere else when I explain how to configure this at the bottom.

First off as far the the minimum bandwidth part goes:

"Minimum bandwidth is 100000 Kbit"

That is just the lowest bandwidth along the path, not necessarily the bw speed of this link. I assume somewhere in this setup there is a 100MB link so thats why you see that. You can manipulate that "minimum bandwidth" simply by setting the bandwidth on the interface you are using or EIGRP:

example...

interface Vlan1303

  no shutdown

  ip bandwidth eigrp mg 10000000 <———

  vrf member mg

  bfd interval 250 min_rx 250 multiplier 3

  ip address 13.13.13.2/24

  ip router eigrp mg

As far as actually manipulating the composite metric of that external route, you have to do that with a route-map in ACI. Here is how you do it 

1) Create Route-Map Under L3 out 

2) Apply Route-Map to BD (static route) under the BD -> L3 Configurations

I also filed to reduce confusion when configuring these route-maps

https://bst.cisco.com/bugsearch/bug/CSCwa81257

https://bst.cisco.com/bugsearch/bug/CSCwa81256

Hope this makes sense.

-Michael G

[Robert Burns]

Your links between the N7K & ACI are indeed operating at 10G - Nothing to worry about there.  Somewhere in your EIGRP topology you likely have a link that's 100Mb - that's what the topology output command is indicating.  It's the lowest bw link in the routing domain used to calculate routing decisions end to end.  

Robert

[joeharb]

That is the confusing part to me, where is the 100Mb connection since I am looking at the route from the 7K and it is directly connected to the Leaf.  The Leaf and 7K are neighbors, with 10G interfaces.  The reason I am looking into this is we have unequal paths between 2 of our Datacenters and I would prefer the traffic between networks that reside within ACI at the respective DC to traverse the 10G link.

Thanks,

Joe

[joeharb]

I am going to open a TAC case to see if I can get some insight on this issue.

Thanks,

Joe