Category: MPLS

Routing loop shambles

This quirk looks into the problems that can arise when using OSPF sham-links over an MPLS network when a dual-homed site is involved.


This blog introduces PBB-EVPN over an MPLS network. But rather than just describe the technology from scratch, I have tried to structure the explanation assuming the reading is familiar with plain old MPLS L3VPN and is new to PBB and/or EVPN.

MPLS Management misconfiguration

There are many different ways for ISPs to manage MPLS devices like routers and firewalls that are deployed to customer sites. This quirk explores one such solution and looks at a scenario where a misconfiguration results in VRF route leaking between customers. The quirk When… Continue Reading “MPLS Management misconfiguration”

Site by Site MPLS Breakout Migration

This months quirk is a bit late. I have been studying furiously and managed to pass my Deploying Cisco Service Provider Advanced Network Routing exam last week. Only two to go before I get CCNP SP. 🙂 Another plus side is that I have a tonne… Continue Reading “Site by Site MPLS Breakout Migration”