Mlag default route

[Edward]

Hi,

I have an question with mlag which my access switch default route should point to which Core Switch? Please refer to below scenario.

]http://i.imgur.com/gNIDTYA.jpg

Core Switch 1
=========================================
Create vlan test10 tag 10
Configure test10 ipaddress 192.168.10.1/24
configure test10 add port 23, 24 tagged
Create vlan test20 tag 20
Configure test20 ipaddress 192.168.20.1/24
configure test20 add port 23, 24 tagged
configure default ipaddress 192.168.1.1/24
enable ipforwarding

Create vlan isc tag 3000
configure isc ipaddress 1.1.1.1/24
configure isc add port 24 tagged

Create mlag peer "peerToCS2"
config mlag peer "peertoCS2" ipaddress 1.1.1.2
enable mlag port 23 peer "peerToCS2" id 1

Core Switch 2
=========================================
Create vlan test10 tag 10
Configure test10 ipaddress 192.168.10.1/24
configure test10 add port 23, 24 tagged
Create vlan test20 tag 20
Configure test20 ipaddress 192.168.20.1/24
configure test20 add port 23, 24 tagged
configure default ipaddress 192.168.1.2/24
enable ipforwarding

Create vlan isc tag 3000
configure isc ipaddress 1.1.1.2/24
configure isc add port 24 tagged

Create mlag peer "peerToCS1"
config mlag peer "peertoCS1" ipaddress 1.1.1.1
enable mlag port 23 peer "peerToCS1" id 1

Access Switch
==========================================
Create vlan test10 tag 10
configure test10 add port 21 tagged
Create vlan test20 tag 20
configure test20 add port 21 tagged
enable sharing 23 grouping 23-24

configure default ipaddress 192.168.1.4/24
configure iproute add default 192.168.1.x ????

Thanks and Regards,
Edward

[Ebrar]

Hi,

In our case there is a router in place of the server. We use active-active VRRP and we have a MLAG configuration. But we should also use BGP between router and SWs. We have two BGP neighbor between Router-to-SW1 and Router-to-SW2. Because extreme guys told us we can not use VRRP IP as BGP peer. So because of the router BGP best route selection process, traffic goes through only one SW. I want to use both the SWs as active. I want to throw traffic from all the links between router and SWs.

So what should i do?

Can you help me?

Thanks,
Ebrar

[dflouret]

Santosh,

Here's a picture of what happens if you route traffic through only one member of the MLAG pair (either because it is the default gateway or because VRRP is configured as Active / Standby).

ALL traffic sent to the MLAG switch that is NOT acting as the active Default Gateway must traverse the ISC link.

[Paul_Russo]

Hello Santhosh im order for MLAG to give you the best solution you really should have VRRP in active/active mode otherwise all of the traffic will go to one switch to be routed. Hope that helps

[santhosh_kumar]

Hi,
I have a query reagrding Mlag in L3 Switch which is acting as a Gateway for all Vlans. we are using BD X8 as core switch in which we have enabled Mlag as below. is it necessary that i have to make VRRP configuration as i can see my gateway switches are working fine with this configuration. kindly suggest me in this regard.

Core Switch 1
=========================================
Create vlan test10 tag 10
Configure test10 ipaddress 192.168.10.1/24
configure test10 add port 23, 24 tagged
Create vlan test20 tag 20
Configure test20 ipaddress 192.168.20.1/24
configure test20 add port 23, 24 tagged
configure default ipaddress 192.168.1.1/24
enable ipforwarding

Create vlan isc tag 3000
configure isc ipaddress 1.1.1.1/24
configure isc add port 24 tagged

Create mlag peer "peerToCS2"
config mlag peer "peertoCS2" ipaddress 1.1.1.2
enable mlag port 23 peer "peerToCS2" id 1

Core Switch 2
=========================================
Create vlan test10 tag 10
Configure test10 ipaddress 192.168.10.1/24
configure test10 add port 23, 24 tagged
Create vlan test20 tag 20
Configure test20 ipaddress 192.168.20.1/24
configure test20 add port 23, 24 tagged
configure default ipaddress 192.168.1.2/24
enable ipforwarding

Create vlan isc tag 3000
configure isc ipaddress 1.1.1.2/24
configure isc add port 24 tagged

Create mlag peer "peerToCS1"
config mlag peer "peertoCS1" ipaddress 1.1.1.1
enable mlag port 23 peer "peerToCS1" id 1