Super vlan concept on ASR 9k

[feableee123]

Hello,

On some non Cisco routers/switches there is Aggregation/super vlan concept, I wanted to configure something similar with ASR with evc/l2vpn.

I want to have one big IP addres pule on dhcp server - all request should be sending from one  BVI helper address.

On subinterfaces l2 I pop tag and join them inside one broadcast domain. Are there any pros and cons for that  config ?

LAN10 (vlan10) -----  g0/0/0.10 l2transport |  

LAN20 (vlan20)  -----  g0/0/0.10 l2transport |

LAN30 (vlan30) -----  g0/0/0.10 l2transport | -------------- BVI 1  (helper address) ---------------- G0/5/0/0 ------    dhcp server

LAN40 (vlan40)-----  g0/0/0.10 l2transport  |

Configuration:

interface GigabitEthernet0/0/0/0.10 l2transport

encapsulation dot1q 10

rewrite ingress tag pop 1 symmetric

interface GigabitEthernet0/0/0/0.20 l2transport

encapsulation dot1q 20

rewrite ingress tag pop 1 symmetric

interface GigabitEthernet0/0/0/0.30 l2transport

encapsulation dot1q 30

rewrite ingress tag pop 1 symmetric

interface GigabitEthernet0/0/0/0.40 l2transport

encapsulation dot1q 40

rewrite ingress tag pop 1 symmetric

l2vpn

bridge group agg

  bridge-domain agg1

interface GigabitEthernet0/0/0/0.10

    split-horizon group

interface GigabitEthernet0/0/0/0.20

     split-horizon group

interface GigabitEthernet0/0/0/0.30

    split-horizon group

interface GigabitEthernet0/0/0/0.40

split-horizon group

   routed interface BVI1

interface BVI1

ipv4 helper-address vrf default 192.168.1.1

ipv4 address 192.168.2.1 255.255.255.0

[Dennis Dubbelman]

I think its better to look into the new bng features on the ASR9K, like "ambiguous vlan" functionality. This feature does exactly what you looking for, but then much easier. You just create a single interface and put al the different vlan's as ambiguous vlans which then belong to a single layer 3 interface. I do believe you need the newest RSP and linecards for it.

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