Monday, November 16, 2020

ISR back to core for MPLS + ISP Routed Block

Hello everyone,

I've got a config I'd like some input on -

I've got a ISR currently being used to tie in a MPLS for voice traffic into a office location. It's got two interfaces currently used.

interface Loopback1

ip address 10.16.145.10 255.255.255.255

!

interface GigabitEthernet0/0/0

description Level 3

ip address 198.xxx.xxx.6 255.255.255.252

ip flow monitor Orion input

ip flow monitor Orion output

media-type rj45

speed 100

no negotiation auto

!

interface GigabitEthernet0/0/1

description TO SWT-CORE

bandwidth 768000

ip address 10.255.255.105 255.255.255.252

no ip proxy-arp

ip pim sparse-dense-mode

ip flow monitor Orion input

ip flow monitor Orion output

ip tcp adjust-mss 1400

negotiation auto

service-policy input DSCP-MARKUP

!

interface GigabitEthernet0/0/2

no ip address

ip flow monitor-Orion input

ip flow monitor -Orion output

shutdown

negotiation auto

It does OSPF back to the core switches via G0/0/1.

I want to add an ISPs LAN block to 0/0/2 then use a sub interface for the WAN block back to down stream routers.

What I think must be done -

Config G0/0/1 as a port channel.

It's IP will be OSPF neighbor and redistribute the MPLS routes into the core. Then have the ISP block as a sub interface like below -

interface Port-channel1.120

encapsulation dot1Q 120

ip address 10.8.120.2 255.255.255.0

ip pim sparse-dense-mode

ip flow monitor Monitor-FNF input

ip flow monitor Monitor-FNF output

service-policy input DSCP-MARKUP

!

interface Port-channel1.999

description ATT Routed block

encapsulation dot1Q 999

ip address 12.xxx.xxx.xxx 255.255.255.248

!

interface GigabitEthernet0/0/0

description ATT Internet -

ip address 12.xxx.xxx.26 255.255.255.252

no ip proxy-arp

ip flow monitor Monitor-FNF input

ip flow monitor Monitor-FNF output

load-interval 30

shutdown

media-type sfp

speed 1000

no negotiation auto

!

interface GigabitEthernet0/0/1

description Internal Network Portchannel

no ip address

media-type rj45

negotiation auto

channel-group 1 mode active

Thoughts? Would the PO not be needed here?



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