default BGP MED value is 0

https://learningnetwork.cisco.com/docs/DOC-2480

An AS is a collection of networks under a single technical administration An IGP is run inside an AS, an EGP is run between AS.
Desing Goals for Interdomain Routing	Scalability Secure routing information exchange Support for routing policies
BGP Characteristics	Reliable updates Triggered updates only Rich metrics
BGP performing areas	Interdomain routing applications Huge internetworks Environments that require complex routing policies
BGP uses	Customers connected to more than one service provider Service provider networks Service providers exchanging traffic Network core
Lesson 2: Understanding BGP Path Attributes
Well-Know	Mandatory Origin AS-path Next-hop Discretional Local preference (default value = 100) Atomic aggregate
Optional	Transitive Aggregator Community (default value = nonexistent) Nontransitive MED (default value = 0 )
Cisco-defined	Weight (default value = 32768)
Lesson 3: Establishing BGP Sessions
BGP States	Idle Active OpenSent OpenConfirm Established
BGP Open message parameters	Version number AS number Holdtime BGP identifier Optional parameters(Type,TLV, authentication)
BGP Keepalive	Default value 60 seconds
BGP Holdtime	Default value 180 seconds
Lesson 4: Processing BGP Routes
BGP Route Selection Criteria	Router check next-hop attribute, excludes routes with inaccessible next-hop Prefer the route with the higher weight. (Value considered local to router) Prefer the route with the higher local preference (within AS) Prefer the route that router originated (redistribution) Prefer shortest AS path Prefer lowest origin code Prefer lowest MED Prefer external EBGP paths IBGP paths closest IGP neighbor EBGP paths oldest path Paths from router with the lowest BGP router-ID
Lesson 5: Configuring Basic BGP
Configuring MD5 Authentication	The first character cannot be a number. The string can contain any alphanumeric characters, including spaces. You cannot specify a password in the format "number-space-anything"
Announcing Networks in BGP	Manually configure networks Use redistribution Use aggregation to announce summary prefixes
Configuring Classless BGP	BGP4 supports CIDR Any BGP router can advertise individual networks or supernets Prefix notation is used with BGP
BGP support for TTL security check	Lightweight security Protects the EBGP peering sessions Supportsdirectly connected peering and multihop peering sessions
Lesson 6: Monitoring and troubleshooting BGP
Common BGP session startup symptoms	BGP neighbor do not become active BGP neighbor is active, session never established BGP neighbor oscillates between idle and active
Common BGP session startup problems	BGP Neighbor not reachable BGP Neighbor not configured BGP AS number mismatch