Route leaking not working

lledidga — Mon, 19 Jun 2023 18:45:06 GMT

I want to create communication btw vrf1 to vrf2 using the route leaking feature.

vrf1: 10.55.51.12/32 - destination reachable through default route -next hop 192.168.246.253-

vrf2: 10.50.18.65/27 - ve 1101

Using below commands, communication does not work as expected

vrf vrf1
address-family ipv4 unicast
ip route 10.50.18.64/27 next-hop-vrf vrf2 10.50.18.65

vrf vrf2
address-family ipv4 unicast
ip route 10.55.51.12/32 next-hop-vrf vrf1 192.168.246.253

I'm assuming next hops are correct, please let me know if somebody has faced a similar issue, or if I'm using an incorrect input for this route leaking.

Re: Route leaking not working

Michael_Morey — Tue, 20 Jun 2023 13:40:26 GMT

Hello,

Thank you for your question. Did you confirm that the source interfaces are UP/UP? If so, we would want to see more of your config.

In my lab I tested with an SLX 9250 running SLX-OS 20.5.1:

POD1-Leaf-1# show chassis Chassis Name: SLX9250-32C POD1-Leaf-1# show version SLX-OS Operating System Version: 20.5.1

First I created 2 VRF named green and blue:

POD1-Leaf-1# conf Entering configuration mode terminal POD1-Leaf-1(config)# vrf green POD1-Leaf-1(config-vrf-green)# address-family ipv4 uni POD1-Leaf-1(config-vrf-green-ipv4-unicast)# vrf blue POD1-Leaf-1(config-vrf-blue)# address-family ipv4 uni

I then picked two random free interfaces and configured them for VRF forwarding:

POD1-Leaf-1(config-vrf-blue-ipv4-unicast)# int e 0/9 POD1-Leaf-1(conf-if-eth-0/9)# vrf forwarding green POD1-Leaf-1(conf-if-eth-0/9)# ip address 10.55.1.2/24 POD1-Leaf-1(conf-if-eth-0/9)# int e 0/10 POD1-Leaf-1(conf-if-eth-0/10)# vrf forwarding blue POD1-Leaf-1(conf-if-eth-0/10)# ip address 10.50.1.2/24 POD1-Leaf-1(conf-if-eth-0/10)# end

Next I configured the basic Static Route Leaking as described in the L3 Configuration Guide:

POD1-Leaf-1(config)# vrf blue POD1-Leaf-1(config-vrf-blue)# address-family ipv4 uni POD1-Leaf-1(config-vrf-blue-ipv4-unicast)# ip route 10.55.2.0/24 next-hop-vrf green 10.55.1.1 POD1-Leaf-1(config-vrf-blue-ipv4-unicast)# vrf green POD1-Leaf-1(config-vrf-green)# address-family ipv4 uni POD1-Leaf-1(config-vrf-green-ipv4-unicast)# ip route 10.50.2.0/24 next-hop-vrf blue 10.50.1.1 POD1-Leaf-1(config-vrf-green-ipv4-unicast)# end POD1-Leaf-1#

However I see no routes were learned:

POD1-Leaf-1# show ip route vrf green Total number of IP routes: 0 POD1-Leaf-1# show ip route vrf blue Total number of IP routes: 0

I found that both ports were down, so I moved the config to two ports that were free and UP:

POD1-Leaf-1# show int e 0/9 Ethernet 0/9 is up, line protocol is down (link protocol down) POD1-Leaf-1# show int e 0/10 Ethernet 0/10 is up, line protocol is down (link protocol down) Eth 0/15:1 connected (up) -- 25G 100G Eth 0/15:2 connected (up) -- 25G 100G POD1-Leaf-1# conf Entering configuration mode terminal POD1-Leaf-1(config)# int e 0/9 POD1-Leaf-1(conf-if-eth-0/9)# no vrf forwarding POD1-Leaf-1(conf-if-eth-0/9)# int e 0/10 POD1-Leaf-1(conf-if-eth-0/10)# no vrf forwarding POD1-Leaf-1(conf-if-eth-0/10)# int e 0/15:1 POD1-Leaf-1(conf-if-eth-0/15:1)# vrf forwarding green POD1-Leaf-1(conf-if-eth-0/15:1)# ip address 10.55.1.2/24 POD1-Leaf-1(conf-if-eth-0/15:1)# no shutdown POD1-Leaf-1(conf-if-eth-0/15:1)# int e 0/15:2 POD1-Leaf-1(conf-if-eth-0/15:2)# vrf forwarding blue POD1-Leaf-1(conf-if-eth-0/15:2)# ip address 10.50.1.2/24 POD1-Leaf-1(conf-if-eth-0/15:2)# no shutdown POD1-Leaf-1(conf-if-eth-0/15:2)# end

Now I see routes leaking as expected as we see the route learned from %green in blue and vice versa:

POD1-Leaf-1# show ip route vrf blue IP Routing Table for VRF "blue" Total number of IP routes: 3 '[x/y]' denotes [preference/metric] 10.50.1.0/24, attached via DIRECT, Eth 0/15:2, [0/0], 0m7s, direct, tag 0 10.50.1.2/32, attached via DIRECT, Eth 0/15:2, [0/0], 0m7s, local, tag 0 10.55.2.0/24, via 10.55.1.1%green, Eth 0/15:1, [1/1], 0m18s, static, tag 0 POD1-Leaf-1# show ip route vrf green IP Routing Table for VRF "green" Total number of IP routes: 3 '[x/y]' denotes [preference/metric] 10.50.2.0/24, via 10.50.1.1%blue, Eth 0/15:2, [1/1], 0m12s, static, tag 0 10.55.1.0/24, attached via DIRECT, Eth 0/15:1, [0/0], 0m23s, direct, tag 0 10.55.1.2/32, attached via DIRECT, Eth 0/15:1, [0/0], 0m23s, local, tag 0 POD1-Leaf-1#

Thanks,

topic Route leaking not working in Data Center (SLX)

Route leaking not working

Re: Route leaking not working