Hello @netbeginner
You can check the learned routes directly in the L3Out policy, for each node:
You can also check the same routes in Fabric -> Inventory -> Pod X -> Leaf X -> Protocols -> OPSF/BGP/EIGRP
Stay safe,
Sergiu
Hi @netbeginner ,
To look for routing tables, you need to firstly keep in mind that every leaf is a router, so to get a complete picture, you will need to look at the routing table of each leaf.
Let's assume you have four leaves, with leaf IDs of 1201,1202, 1203 and 1204.
Keep in mind:
- You will only learn OSPF routes on the border leaves
- You will only learn MP-BGP distributed routes on non-border leaves
The BEST way to check the routing table of all leaves is NOT from the GUI, but from the APIC CLI with one of the following commands:
fabric 1201-1204 show ip route bgp vrf vrf_name
fabric 1201-1204 show ip route ospf vrf vrf_name
The equivalent BGP information can NOT be seen in the GUI since ACI v4.2 - at least not all of it.
You can see the equivalent OSPF information in the GUI ONE LEAF AT A TIME by navigating to: Fabric > Inventory >> Pod1 > Leaf_Id > Protocols > OSPF > OSPF for vrf_name > Routes as shown below
Unfortunately, the ability to view BGP routes in the same way was removed in ACI v4.2 (from memory) - for BGP you need to resort to the CLI (which gives a better picture anyway)
I've put examples of both commands below for a 2 Leaf topology that has an OSPF border router attached to Leaf1201 - as per this picture:
In the examples below, you can clearly see that leaf 1201 has OSPF routes (learned from the external router, but no BGP routes), whereas Leaf1202 has BGP routes (learned via MP-BGP) nut no OSPF routes because it is NOT connected to a border router.
apic1# fabric 1201-1202 show ip route bgp vrf Tenant18:Production_VRF
----------------------------------------------------------------
Node 1201 (Leaf1201)
----------------------------------------------------------------
IP Route Table for VRF "Tenant18:Production_VRF"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%<string>' in via output denotes VRF <string>
----------------------------------------------------------------
Node 1202 (Leaf1202)
----------------------------------------------------------------
IP Route Table for VRF "Tenant18:Production_VRF"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%<string>' in via output denotes VRF <string>
1.1.1.18/32, ubest/mbest: 1/0
*via 10.1.120.64%overlay-1, [200/5], 01w03d, bgp-65001, internal, tag 65001
10.118.0.201/32, ubest/mbest: 1/0
*via 10.1.120.64%overlay-1, [1/0], 01w03d, bgp-65001, internal, tag 65001
10.118.1.0/24, ubest/mbest: 1/0
*via 10.1.120.64%overlay-1, [200/0], 01w03d, bgp-65001, internal, tag 65001
10.118.10.0/24, ubest/mbest: 1/0
*via 10.1.120.64%overlay-1, [200/5], 01w03d, bgp-65001, internal, tag 65001
apic1# fabric 1201-1202 show ip route ospf vrf Tenant18:Production_VRF
----------------------------------------------------------------
Node 1201 (Leaf1201)
----------------------------------------------------------------
IP Route Table for VRF "Tenant18:Production_VRF"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%<string>' in via output denotes VRF <string>
1.1.1.18/32, ubest/mbest: 1/0
*via 10.118.1.1, vlan109, [110/5], 01w03d, ospf-default, inter
10.118.10.0/24, ubest/mbest: 1/0
*via 10.118.1.1, vlan109, [110/5], 01w03d, ospf-default, intra
----------------------------------------------------------------
Node 1202 (Leaf1202)
----------------------------------------------------------------
IP Route Table for VRF "Tenant18:Production_VRF"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%<string>' in via output denotes VRF <string>I will offer one final option for the GUI - you can see all routes learned by a leaf by the convoluted process of navigating to: Fabric > Inventory >> Pod1 > Leaf_Id > Protocols > RIBV4
From here, locate the VRF you are interested in in the work pane and double click on it. This will open up a new window
In the new window, click the Operational tab
Now, painstakingly expand each of the routes there to reveal the learning source. Below is the same information as seen much more easily from the CLI.
I hope this helps.
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